It's a bad game that isn't worth more than $5 (and even then I have a hard time justifying that).
However it does capture (unintentionally) the clunkiness of piloting a giant robot the same way Steel Batallion and R.A.D. does. GMs, Zakus and other MS that walk move a lot slower than the Dom. Also Beam weapons are extremely OP as they're shown in the show, and a lucky bazooka shot might kill you. However the melee is completely broken and unless you get luck it's just faster to shoot the enemies point blank.
Sadly if it were more polished it might be a mediocre PSP Gundam Assualt game with balancing issues.
Also Bandai managed to salvage whatever engine they were using by making U.C. 0081, which is fun, and Gundam Side Stories, which is ok, playable unlike Crossfire.