I say, cut the crap and handle the movie properly.
I don´t care if Tony Stark is in the movie or not, i don´t care for eye candy for the fanboys, i care about the movie be good or not.
If it´s handled properly, i say, cool, but so far, it makes me think about the same as to have Nick Fury in the movie, eye candy for moronic fanboys (if you get offended, is because you are one and you know it, so, think before acting stupid and reply).
Any movie that spends time to advertise that there will be a crossover, my first reaction is that will be a fanboy´s movie, which is not something to be excited about.
A movie made for fanboys is something with a lot of eye candy and winks to the fans, but a lousy movie.
That is my biggest fear with Iron Man, Favreu is a fan (hence the eye candy and winks, which there will be), but he still have to show he is great as a director (hence the lousy movie).
I hope this one doesn´t fall there too, but my hopes are not all that so far...