The whole "but he got paid for it, so ****" argument only works in a business setting, *not* in a creative setting. Actors, like directors, writers, singers, musicians and poets, are creative talent. So money isn't the final determinant of success. Instead, what creators are looking for is validation of their talent.
Look at the b.s. a screenwriter has to go through. If I write a spec script I really love and believe in, and I sell it to Studio X for a set advance, and then they wipe their collective asses with it and turn it into a laughingstock, you think I don't deserve to get pissed? One, they've taken the vision I had and completely twisted it, and two, they've sullied my name to the point that *I* get the reputation of being a crappy writer.
So yes, Rourke has a right to complain if he feels that the studio made his role into a laughingstock (they did) and hurt his chances of getting meatier roles (that, however, remains unproven).