Re: X-Men 3: WHY all the hate?...seriously it was awesome!
I didn't like that they had to kill Prof. X and Cyclops, it was ok for Jean dying since she could've just been brought back for X-Men 4.
Another is that for it being the "last" in the trilogy what was up with the short running time? For a grand last stand it could've been at least 2 hours.
Aside from those minor squabbles the action was good, the acting by Hugh Jackman was excellent and this one had the better music score of all three movies by John Powell.
A few of the Marvel Superheroes are somewhat niche characters that aren't extremely versatile, thus they don't have a lot of longevity potential. For example, Namor is a water guy, Silver Surfer is a space guy, Dr. Strange is a magic guy, and so on.