God, I spent hundreds of hours of my life playing this game and I can say it's the complete and absolute sucker, even when you do your best trying to custom the rules and skills as well as mechs specs to get something more or less related to the original show, wether it is mecha combat or the whole 'universe' (but it's true that this last one's particularly messy anyway...)
If you want a good mecha-based RPG, go for Mekton (dunno what release they're at for now, I ceased to play RPG a while back...) and reproduce what you need from this awesome building system by Talsorian Games, it'll be easier, quicker and more accurate in being more faithfull in the same time