I saw it last night. I really think it's kinda sad when people (internet geeks/"critics") bash the hell out of these types of movies, when it's obvious ALOT of hard, collaborative work goes into making them (as an aspiring filmmaker, I can certainly appreciate that.)
Overall, the screenplay did a surprisingly good job of cramming in so many popular characters in the story and making it work. Sure, Gambit and Deadpool were thrown in to please fans, but they actually furthered the plot along and weren't just thankless cameos like Jubilee in the first two X-Men or Dr. McCoy and Colossus in X2. My only real nit-picks were the lack of focus on Wolverine's character for the first thirty minutes of the film, and how soft and boy-scout like he was in the earlier flashbacks. They spent so much time developing the supporting cast, he was just kind of there, and doesn't get much development until
Wolverine is called an "animal", and the "best at what he does... which isn't very nice," yet we never really see much of that, considering he is the softest of Stryker's team. However, it does establish that despite Wolverine's look and feral nature, he is a genuinely good man in contrast with his gleefully violent brother.
So overall, it was a fun, entertaining summer flick made in an attempt to take your money (just like every other franchise film, including the upcoming T4 and STAR TREK.) It took mine, and I was more than happy to give it to them. It wasn't perfect, but a film should be judged for what it is, and NOT what it could be. For what it was, it was a fun blast, that gives some interesting insight to the Wolverine character, a decent lead-up to X-1, and a chance to finally see characters like Sabertooth and Gambit do what they do best.
Can't wait to see what they do in the upcoming MAGNETO film.