Even with those moments of glory, the gameplay gets old pretty fast. The close-up duels are sluggish, and you'll usually end up doing the same attack animation over and over until your shattered enemy decides to keel over. Sniping only really works when your target is standing still, and a successful firefight almost always boils down to locking onto an enemy and running in circles while shooting them with power-pellet-looking bullets.
Granted, things get more interesting when you eventually earn more powerful mecha, more varied weapons and squadmates who'll actually respond to your simple commands (which don't carry any sort of visual or audio confirmation that they've been issued or understood, by the way) instead of just standing around dimly. But that takes a while, and you'll encounter plenty of frustratingly difficult enemies and seemingly cheap deaths until you reach that point.