These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Sabretooth. Were you really expecting anything less?
Stryker's hardly an angel either.
Hilarious in Hindsight: Real world instance: Fans had been clamoring for Gambit to appear in X-Men films since the first one. The public response from the directors and writers was "If we include him, we want to make him integral to the story. We're not going to just throw him in there because he's popular." Come this film, Gambit is in, fulfilling a minor role which could be handled by pretty much any character. It really seems like the studio executives just thought, "Who's a popular character we haven't used yet?"