Storm was probably the least engaging of the characters (hell, I always hated her in the comics as well), but I really dont think they invested anything in what was essentially a bunch of supporting characters.

They should have spent more time on fleshing everyone out, but they didnt.

The big actors characters like Prof, Magneto and Storm obviously made sure they got their share of the limelight, but the films certainly revolved around Wolverine, and credit to the then unknown Jackman, for out doing all of them.

I have to give credit to Anna Paquin for at least having some presence, but who even noticed that the likes of Cyclops and Iceman were even in the movie as heroes?