Finally got a chance to play with my 11yo son, a big Trek fan. I've never played an ACTA game, though I've played a bit of Starmada and Full Thrust.
We did Fed v. Kling, with 2xD7s going up against 2xFarraguts and 1xConstitution (which is a MEAN ship, btw).
In my opinion, the Critical system and Special Actions are what really give this game flavor. I was a bit dubious about getting damage past shields that are up on a 6 roll, but in play it works very well. The whole damage and shield system worked much better in practice than it had in my imagination. And watching your opponent roll 16 dice for two overloaded photon torpedo hits is intimidating. (He's already knocked down the last of my shields with his Phaser-1s. The crits were debilitating, and the "Escalation" effect is TONS of fun, as long as you don't mind losing sometimes, LOL.)
We played a "line 'em up and shoot 'em" scenario. I'm hoping for a more strategic scenario next time, or at least to put some space debris on the table.