Not gonna lie, its actually kind of fun in a sort of simplistic way. Its kind of like playing a dumbed down armored core or Zone of the Enders, where you're in a giant arena and asked to fight other large monster/mech like enemies. Not the greatest thing in the world, but if you're looking for something easy to play try this.

Note: I played the psp version because that is the copy i owned as a kid and wanted to take a shot at playing again. Never played the console ports, though I guess i should take a look at them at some point.