Gundam Evolution might have shamelessly lifted some of its presentation and mechanics from other games (and I think it did), but it’s still a great game at the end of the day. All of the combat feels fun and well-balanced, and the way the Mobile Suit’s abilities work in the heat of battle only add to the excitement.
There is some eye-rolling at the game’s monetization, and Guntank’s slipperiness should be fixed, but overall, it’s a well-made, entirely free game that doesn’t force your hand to cough up any amount of money. Considering all of this, Gundam Evolution is absolutely worth your time.