I know nothing about the X-Men comics and all I really knew about the X-men, outside of the movies, was the cartoons from the 80s or 90s. Cyclops always seemed like a cool character in the cartoons, but in the movies he's a bit of an emo douche. I assume that is not how he was in the comics?
mostly bad casting that plagued many of the Fox movies, but i think a character's powers are a huge reason why a character might change from book to screen - esp those stories that developed when cgi was still developmental
Wolverine became the xmen standout bc his powers were easiest to portray and also jackman was a stronger performer than any of the rest of the team (except patrick stewart obviously - but X's powers are very tricky to get right)