I'm on Episode 5 and here's my opinion of the characters so far.
Michael: A total asshole but also pathetic. He's really funny in that you feel pity for him but the shit he gets is so funny and deserved.
Dwight: Dwight is... awkward. He's an asshole like Michael but he's far more delusional than Michael is and that's just ridiculous, in the good way.
Jim: Jim is awesome. He's funny and you can feel sorry for him having to put up with Dwight and Michael's crap.
Pam: Pam's really nice but not meek thankfully. She also doesn't put up with Michael's crap when he tries to blame her for shit and I find that awesome.
Ryan: He hasn't done enough yet in these first five episode for me to form much of an opinion on him.
Angela: Meh, she's strict and hasn't done much.
Kelly: Deserves points just for slapping Michael.
Everyone else: I feel so sorry for everyone who works with Michael and Dwight, they really are just the most petty men who try too hard to be likeable to their coworkers.
Anyways, this is just a brief analysis right now, I'm sure these characters will be doing more come the rest of the season.