Dynasty Warrior Gundam 2( X BOX 360)

It’s a hack-and-slash / action game with the classic "Warriors" style: you control a Mobile Suit (mecha) and fight hordes of enemies.

Has both Official (Story) mode and a Mission mode, plus additional modes like War Mode, free missions, etc.

Huge roster of playable mobile suits (~66), including not just major Gundams from different series (Universal Century, SEED Destiny etc.), but also “grunt” units like Zakus and Jegans.

Features “Mobile Armors”— bigger enemies/boss-type units like the Psycho Gundam that require special tactics to deal with.

There’s also a parts / upgrade system: parts for arms/legs/torso, parts can be improved, skills can be added, mobility/defense/offense vary by part.