Shit gets retconned all the time in comic book land. I don't see why this is surprising, especially since they saw fit to tell us Spider-Man's origin story twice in a bit over a decade. 

Or the fact most superhero movies have interchangeable characters, conflicts, plots, and resolutions. 

Also, X-Men: Origins was a horrible, horrible movie so I don't see why you think it's bad that was discarded 

You can't tell me this was faithful to characters:

[IMG]http://static.comicvine.com/uploads/scale_super/1/15659/1684859-moviedeadpool_doesnot_deadpool.jpg[/IMG]

And also, you may wish to put spoiler tags on this because people may want to be, I don't know, surprised at how things turn out. Particularly the whole Mistique thing. 

Also, I never watched The Wolverine because I really didn't feel like watching [I]another[/I] Hugh Jackman Wolverine movie*, especially where he's decided to embrace his inner Weeaboo and turn into Tom Cruise in The Last Samurai. Move over, Japanese people, whitey is going to show you how much better he is at your culture. Pass.

*To date, there's been SEVEN appearances of Huge Jackman Wolverine in movies, which he had a leading role in 1-3, Origins, and The Wolverine. First Class was a brief cameo, but now he presumably is back in a fairly large role again. Enough's enough.