I liked this season. I disagree with what some folks are saying about Peter. I think he's by far the most interesting character in the ensemble. His story ought to be the main trunk off which the others branch from.
The pacing was good this season, although I think I rather would have seen have the fallout from Kirby Plaza rather than a new storyline.
I think we could have explored the characters we did have instead of introducing new ones; I find Bob, Elle, the Twins, Adam et al compelling but ultimately, find the first season cast more interesting with the exception of DL, who had the good sense to be killed.
Suresh, Parkman, and Nathan were all underused this season. The Haitian appeared, disappeared, reappeared, etc. Why wasn't he there with HRG at the showdown this past Monday?
I just hope these writers stop having tantrums and get back to work.