The fact such a minor thing was the only real negative I could find about the game should tell you something, but I do stick by it. :]
I'm aware capital ships shouldn't be jumping around like mental, but the only ships that move at all are too small to even see at a decent angle. Theres plenty of TV shows and Games that manage to make space combat interesting, and while it's only a superficial thing, I do think it matters a little.
As for it being bad for gameplay, it'd only be bad from a 'realism' perspective, I think? And after all, you don't play the game with the sound effects off for 'added realism', so why play the game where no ships move for added realism?