Well I've watched the whole haruhi series, and frankly the only reason I did so was in hope of it getting better and understanding why people where so hyped up about it. But I didn't so I tried watching it again and the second time it was even more boring, and I still didn't get it.
It's a nice show, but the interesting philosophical/psychological question which provided the red line could have used a bit more depth.
Don't get me wrong it was nice, but not that great in my opinion. I'm not sorry for watching it, but it's not a show I will refer to other people.
Ouran, I found to be a great series, and I still watch an episode at these rare moments I feel like some 'feel-good stuff'.
So Ouran would be my choice of the year 2006.
Off to watch the mentioned series not yet seen by my eyes