For the purposes of the episode, it was fine. It instantly said "this is the same Enterprise but with more POWERRRRR!!!" It did the job it needed to do, and I enjoyed watching it kick some ass at the critical moment.
But it was a quick and dirty hatchet job. No grace, no elegance. Three nacelles doesn't even make much sense, and a whopping great phaser cannon is no good unless you're flying straight towards your target. Also, it looks ugly. Powerful, but ugly.