I agree. I kept hoping that season two would get better at some point, but alas, no dice. And I was a bit put off by season three's premiere, but it's really ramped up since (even though I entirely hate what they've done with Mohinder).
And I actually do really like Arthur Petrelli's character. For a season one villian, Sylar was great but Arthur Petrelli is a bit more of an Apocalypse (for X-Men fans) level villian than was Sylar.
And I'm eagerly awaiting next week's continuation of this week's cliffhanger. That was truly unexpected.