AEUG vs Titans is awesome, but you need a means of playing imports.
The graphics, while they won't astound you, are certainly good enough to be playable. They defenitely seem better than Renpou vs Zeon. (Federation vs Zeon)
The gameplay is what really matters, though. Somehow, everything just seems so dynamic. Missions will flow so well, jumping up and diving down on opponents to slaughter them with a meele combo, then wheeling around and transforming to blast off toward the next target, and shooting it down in a hail of beam fire.
Rarely have I ever played a game and wished I could replay a mission, but there's nothing like being on the surface of the moon, piloting a Marasai, in a fast paced battle with oncoming hordes of GMs and Nemos, all set to "Believe in the Sign of Zeta".