Re: Why is everyone slamming TDKR?
They gave Iron Man an "ending" because Robert Downey Jr has finished his contract and at the time of production, and possibly still now, it was unknown if he would return.
But it's not really an complete ending. This is just a maturation of Tony, he doesn't need to focus his life on the suits anymore (which is why he didn't get rid of the arc reactor in IM2, like someone brought up), he can focus on Pepper. But his monlogue very clearly states "I am Iron Man" and we know from that, if the need arises, he can come back.