I'm probably not the best person to start this thread, since I was lukewarm to the show in its first season and was fairly critical of the second. I read an article in Wizard that makes me skeptical of the upcoming season as well.
Bigger spoilers, from a screening of the first two episodes. Avoid this section if you don't want some info from those eps! You've been warned:
The wording was cryptic, but Mohinder gets powers? Ando may or may not get powers? Come on! Isn't it better to have some characters who are powerless? Doesn't it make more sense narratively, since development of powers is supposed to be rare?
Some of you will probably be mad at all this and say, "Why are you watching if you don't like it?" Good question. There's enough in there to keep my interest, surrounded by a ton of things that drive me nuts. I'll try to balance my posts as the season goes on and not just drop in to say negative things. If I can't find anything good to say, maybe it will be time to end my viewership.