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I will post my opinions first in a form format, so you can either choose to copy and use the format, or make up your own.

Basic Opinion/What You Answered in the Poll: I absolutely love and adore Jounouchi.
Why You Hold That Opinion: [SPOILER WARNING] Jounouchi Katsuya is a very special character to me. He has been my all-time favorite character, from any franchise, ever, since I was in junior high, which I've always found somewhat strange, since I have a tendency to prefer more mature/serious characters, plus I've never been fond of blond hair or brown eyes. He was also the character that I first started reading/writing fanfiction of and pairing up in yaoi pairings.
There's always just been something about Jounouchi that attracts me to him as a character (though I do not have an anime crush on him; that's just... no), and I've always had to do a lot of thinking on why that was so.
Jounouchi is the underdog of the series. There's no denying that. He's the character who always has to work to be up to par with the main characters and their opponents. Because of this, I feel like Jounouchi is a more believable character. He has far more flaws than most of the good characters, but he's constantly struggling to improve them. What makes him even more believable is that, like so many real people, he acknowledges and tries to improve on some flaws, but others he's completely oblivious to (or chooses to ignore).
I suppose that even though Jounouchi was just as involved in the plot as the other main characters, he seemed to grow far more on his own. While Yuugi and Yami no Yuugi grew through and for the main plot, Jounouchi was constantly deciding to improve on his own. He stopped getting into fights once he became friends with Yuugi, he worked hard to prove his worth in Duelist Kingdom, he did all he could to show his love for his sister, even though he hardly got to see her at all, he vowed to win his Red Eyes back from Yami no Yuugi by becoming a true duelist... the list just goes on. It always felt like to me, Jounouchi would constantly be having his own little side plot going on (except in the Memory Arc), but he would never have his own problems distract from the main plot. On the contrary, his own development as a character enhanced the main plot, giving the two Yuugis support and advice through what he had learned about himself already.
I feel this made Jounouchi a very interesting character, because while the two Yuugis and the main villains were mostly affected and changed by the main plot, Jounouchi was always changing through his own will, while the other side characters really didn't have much development at all, sadly. Every once in a while they would have a plot that revolved around them and allowed them to grow, but it was never an on-going thing like it was for Jounouchi.
Aside from the development the guy had in the series that made him more interesting and human to me, I also just love Jounouchi's personality. He never acts just one way (like how Kaiba is always arrogant, or how Shizuka is always sweet), but changes his actions based on his feelings, and is not afraid to wear his emotions on his sleeve. Jounouchi can be happy-go-lucky one second, but once he's insulted, he's completely pissed off, and will let everyone know. Once the insults are over, he could suddenly be happy again, or perhaps low on self esteem, or maybe arrogant. His moods are constantly changing and flowing, and yet each reaction and emotion he shows suits his character.
That's something that also makes Jounouchi a very fun character to roleplay or write fanfictions of; you're never stuck in one phase. You get to play the happiest guy in the world, the most depressed guy, the most angry guy, the funniest and goofiest guy, the most arrogant guy, the guy with the lowest self esteem, and the guy who knows how to get people to try harder, including himself. He has so many personalities to him, and I just love them all.
Jounouchi is no where near perfect, and that is exactly why I love him so much.
Favorite Characters to Pair With: Kaiba Seto, Malik Ishtar, Rishid Ishtar, Mutou Yuugi, Yami no Yuugi, Honda Hiroto, Otogi Ryuuji, Bakura Ryou, Yami no Bakura, Kajiki Ryouta, Mazaki Anzu, Kujaku Mai, Pegasus J. Crawford, Kaiba Mokuba... I guess all the different emotions he shows so easily make him easy to pair with so many people. Gosh I make the poor guy such a slut... XD;;
Rating of Favoriteness: Definite most favorite character from anything anywhere.

Wow, we seem to almost completely agree on the reasons we like Jounouchi. XD I just take it a bit further to the love category. I think it would be a dream come true if I had Jounouchi for an older brother and Shizuka for a little sister, but that would also be quite weird.

I know, I was like, "...is she just summarizing my post...? Or did she not read it yet, because that's kind of weird if she didn't. XD"
I'm actually quite fond of my brother, but I wish my sister was more like Shizuka.

It seems like almost everyone has a not-so-good sibling. I flat-out despise my only full-blooded sibling, the one I wish was more like Shizuka. I love my half-brother and one of my half-sisters, then the other two half-sisters, I enjoy their company, but don't feel like I know them enough to really be close to them.

Haha, Jounouchi's personality is definitely a bit... on the strong side. XD I can easily see how it's an acquired taste. He annoys me at times too, but not enough to detract from my love of him. I think the time he got on my nerves the absolute most was when he lied to Mai about her being in his dream. That was just... a horrible thing to say to someone who was just beginning to feel comfortable having real friends.

Well, that's part of what these threads are for, seeing if we can learn more about the characters, and why we feel what we feel for them. :3

Mai is awesome. <3 Now I'm eager to get to her thread. XD;;
Yes, I totally agree, that it wasn't something he did intending to be a jerk, but just a panicked reaction that was really stupid. Though he pissed me off more than he ever has then than in any other situation, I was still only mildly peeved. That might be another reason I love him so much, because the worse thing he ever did really wasn't too horrible at all. XD;; And as you said, I could never hold that mistake against him either, especially since he tried to make up for it in the end. If anything, I think he let that mistake teach him that it's okay to express feelings you might be embarrassed of, because after that he was waaay more loving towards Mai, in a friendshippy way at least.