Originally Posted by spideyboy_1111
Again.... Harry potter did it just fine. Problem is fanboys want everyone front and center and integral and developed and that's not going to happen. Some are main characters some will be supporting. And others tirtiary like every movie
It all depends how it's done though.
Most times when there have been cameos in the X-Men films, there has been complaints from fans, or it has caused continuity issues further down the line (like having a human Beast in X2, or Emma in X-Men Origins: Wolverine, or a glimpse of Storm/Cyclops in the First Class Cerebro).
People were okay with the Colossus cameo in X2 because it seemed like an introduction to a bigger role in the next film. But even then, there were a lot of people wanting more from Colossus in X2 itself. And a lot of fans weren't happy that Deathstryke was just a henchwoman with no real backstory or characterisation.
So it's a fine line to tread.
Part of the problem is that different writers and directors have made the X-films, so there is no 'grand plan' of which characters will be introduced and when.
Writers and directors also have to be aware of which characters are fan favourites - like Deadpool, Gambit, Psylocke, etc. It's no use messing up their appearances on screen and any cameos should only serve as foundation for a larger role in another movie.