I tried, I really did.
Love season 1. Tolerated season 2. Got 5 episodes into season 3, then gave up because I was sick of how stupid everyone was being. (Looking at you, Hiro and Mohinder.)
At least season 1 was fun. I was especially fond of Hiro, Ando, and the Haitian. I can't say that I liked Noah Bennett, but I admired him. The guy is a badass.