Rank the Entire Series

My Rank:
X2 (2003)
X-Men (2000)
X-Men: First Class (2011)
X-Men: The Last Stand (2006)
X-Men Origins: Wolverine (2009)

While it's rating might say otherwise, I found The Last Stand to be quite entertaining (especially after I saw Origins, which made it seem like a masterpiece in comparison). What I would like to know (in as civil a manner as possible) are some legitimate reasons why others don't like it. It had some interesting plot ideas and involving action sequences. On the flipside, however, I understand that the film's various plots don't add up to a cohesive whole and most of the choices made with the characters were maddening. Aside from this, however, I had no real issue with the film. Origins, on the other hand, not only struck me as a lousy comic book film but just a terrible movie overall, with its shoddy special effects, cliche plot, lack of respect for continuity (which First Class is also guilty of, but it's actually good) and magic bullets, among other things. Thoughts?

"That'll be the day." - John Wayne in The Searchers