Dynasty Warriors: Gundam is exactly what you will expect. If you go into this thinking "I hope that this is alot different from Dynasty Warriors!", then you are going to be disappointed. This follows the Koei formula of "If you send waves of waves of peasants, they will come.", though substitute peasants for giant fighting robots.
If you don't enjoy Dynasty Warriors, you will hate this game. On the flipside of that, this is a fresh, new environment to kill in.