Hercules over at aintitcoolnews.com was a big fan of the show too but it sounds like he's hopping off:
http://www.aintitcool.com/node/38713
His reference to the "idiot plot" is spot on:
In literary and film criticism, an idiot plot is a plot which (in the words of the Turkey City Lexicon), "functions only because all the characters involved are idiots: They behave in a way that suits the author's convenience, rather than through any rational motivation of their own." Alternate formulations describe only the protagonist as being an idiot.
And, indeed, Peter, Nathan, Noah, Angela, Hiro, Claire, Sylar and other major characters all seem to have had most of their IQs slowly sapped away by the Haitian over the last two seasons.