Ya really cant say much for "the cure" either!
Magneto was the last person to be injected with it, and was even injected with four times the normal ammount, yet his powers are already returning at the end of the film!
What does that say about all the people who got a normal dose?

When Magneto dropped the bridge, and I do mean droppped, why did nobody fall off?

Why didnt Juggernaut die when he was phased into the floor?
By rights his molecules should have been mixed with those of the floor, killing him outright!

Another huge missed opportunity was the fact we never got to see Colossus & Juggernaut duke it out!

Why did Xavier blame Wolverine for Jean Grey when it was his own carelessness that caused the problem?

Why did Storm not aknowledge that people like Beast & Rogue would benefit from the cure?

Where was the humour that permeated the first two films?

Why did Storm chew out Wolverine for not being a team player when he had just worked out a move with Colossus (the fastball special)?

Why did they have Sentinels in the danger room when they havent been invented yet?

You can seriously tell there was a completely different creative team on this one!
Its not comic geek type complaints (that'd be complaining about Juggernaut not being a mutant etc), its purely based on the fact that the film was flawed to hell and seemed half finished!