I think it's definitly worth it, especially on the psp which is the version I have.
It CAN get repetitive, but on the PSP you notice less. If you are going on a long journey (or even a short one) the bite sized gameplay seems to suit the psp perfectly. The graphics are splendidly comic book style.
I wouldn't say it doesn't have much a story...it doesn't have many cutscenes, true, but there is a lot of story to be found by exploring the game and characters who all yield nuggets of storyline information and information on the x universe in general. You can get as much or as little from the storyline as you please. The actual story is a mix of several storylines such as Age of Apocalypse or the twelve.
There are much more characters (many with age of apocalypse costumes! Yayness!) and cameos (including Blink and Omega Red). PSP also has several exclusive characters including Cable, Dark Pheonix and X Man. Heck at one point you can even choose to bring Iron Man into the frey!
The PSP version has 9 comic based exclusive missions as well which adds a little more value , especially to x fanatics such as myself.
The skirmish mode is very cool as you can fight as almost anyone (sadly Omega Red is not one of them
) I think this could be improved to have no time limit and just go until one team remains standing, and to encompass ALL characters, including bosses and sub bosses.
For all it's flaws though, this is a shining example of how comic book games should be done. Faithful to the source material and fun. If you have any amount of love for the x men, at the VERY least it's worth a rental.
7.5 out of 10.