X-men (1) was really good, X2 (X-men 2) not bad, X-Men: the last stand (X-men 3) had what I'll call "the Magnolia effect". Where it builds and builds to something huge... that never happens. (Sidenote, Magnolia is one of the worst movies ever made, due to a lack of continuous story, huge plot holes and I guess you're supposed to be tripping on LSD when the frogs start falling, oops spoiler - you want to see a good John C. Reilly movie? can I suggest Step Brothers?). Back to X-men movies, Then came Wolverine, err X-Men Origins: Wolverine, which in itself wasn't terrible either, if they had just not tried to cram so many characters and story origins into a single movie. Having said that there was a reason it didn't do well in theaters. NOW Marvel is making a reboot/prequel story to the X-men franchise, X-Men: First Class. Honestly, from the trailer embedded below, it looks good. Sidenote: can we get a standardized naming scheme? At least Star Wars puts numbers on their movies.
From the Wikipedia page (and you know everything on Wikipedia is 100% accurate):
The film, set during the 1960s, will focus on the relationship between Professor X and Magneto and the origin of their groups, the X-Men and the Brotherhood of Mutants. The film stars James McAvoy as Professor X and Michael Fassbender as Magneto. It also stars Kevin Bacon as Sebastian Shaw, the antagonist of the movie. Other cast members include January Jones, Rose Byrne, Jennifer Lawrence and Lucas Till. The film is mostly being shot in England and parts of the United States. Fox envisions this film as the first in a new trilogy.
Check out the trailer below.