Yeah, I'm struggling with Heroes... I can't stand to watch, yet I can't stand to let go. Season One was one of the best overall seasons in television history, if you ask me. Two started off well, but by the end of it... Dang. And it's been gradually down hill from there.
As for Lost... Season One still has to be my favorite, followed closely by Season Four. Gotta love my Daniel Faraday. This season is just... odd to me. I enjoy it and have no complaints, it's just so... different.
Oh, and I might add that the Sawyer/Juliet pairing is sort of awkward.