As was mentioned by at least one other reviewer, this is a side scroller with some lateral movement like back in the NES days (think TMNT 2). The gameplay is ok, but does seem a little repetitive. Since you can have 3 allies, but a couple other helping characters, just battling a few enemies can make it very difficult to have any idea where your character is or what is going on with everyone doing big, graphical attacks.
I was really surprised this was even a packaged disc game. If it were $10 on PSN, it would seem appropriate, but it just doesn't offer nearly as much as many other games for this system. I don't think anything was done that couldn't have been done on the NES or SNES with a minor graphics downgrade.
Overall, I would say it was worth the rent, but I can't imagine anyone spending $30+ on it and feeling like they got their moneys worth.
As a side note, the extremes to which they applied gender stereotypes provide a level of comedy to the game as well. The females are boobing out all over the place, and the male characters put steroided body builders to shame. I was a bit surprised at it, but it is so absurd you just have to laugh.