I remember downloading the first season for YTF a long time ago. I tried watching some of them and never really could get into it, namely because I thought Haruhi was too much of a bitch.
Then I found out that that's the type of character she's supposed to be. Though "Haruhi-ism" has gotten quite a following and the show's been touted as critically acclaimed, I panned it.
But, if I were to try watching it again, it'd be for Nagato Yuuki. Aside from Kyon, she's one of the show's characters that I like, and to me she comes off as Rei 2.0.