Huh... my take on all this seems to be different than most.
With the exception of New Avengers (which IMO mishanded Peter's character from the get-go) I have not seen the "lacky" or "dumbass" angle to Peter that people have been complaining about. I saw him being TRUSTING of someone who has done A LOT for him and his family, who he has respected as a hero and who initally made a lot of sense... And it isn't blind trust, as we are seeing now.
The Superhero Registration Act - what little we know about it - sounded reasonable on the surface. Understandable and inevitable. Training, accountablity, colaboration, compensation... But the "execution" of it has become over the top. (A thinly veiled, bad, exaggerated, mischaracterization of current events - give me a break - that and an obvious device to have heroes matched up in fights.) But I could see why initially Peter wouldn't have thought to start a rebellion over it.
Peter wasn't forced to unmask. That DID seem out of character for him, but I guess I can see how he could make the mistake... things seemed different... [SIZE=-1]new rules with the SHRA, unprecedented respect and sense of protection with his position in the New Avengers. (Some of his fellow heroes have been telling him for awhile that secret IDs are passe too.) [/SIZE]May and MJ are proud of him, they encouraged him. (I expected MJ to know better, but, then again, things seemed different...)
So now, as things are unfolding, Peter is learning what we've all been privy to... who are the "good guy" and who are the "bad guys."