I don't mind the "balance" of NX-01 - after all, Kirk's ship had nothing above the saucer to balance out the secondary hull... But the design does appear both too ungainly to be either "sleek" or "flimsy", whichever quality would better fit the ship of our early heroes. It's not "stocky" enough to create the impression of old-fashioned engineering, either. Something more distinct from TOS and TNG might have been better...
But we can easily argue that humans only get to play space exploration after inventing the Starship, after which there is no real evolution of said invention for a couple of centuries: it's a quantum leap thing. No Star Trek until you have phasers and transporters and (after a very slight delay) shields and tractor beams - but when you have those, and discover that everybody else has those as well, and has for centuries, the incentive to do significantly better evaporates.
Once the time comes to invent something truly new, it's the end of Star Trek, and a fundamentally different fiction takes its place. Conversely, before the invention is made, it's not Star Trek yet.
Timo Saloniemi
But we can easily argue that humans only get to play space exploration after inventing the Starship, after which there is no real evolution of said invention for a couple of centuries: it's a quantum leap thing. No Star Trek until you have phasers and transporters and (after a very slight delay) shields and tractor beams - but when you have those, and discover that everybody else has those as well, and has for centuries, the incentive to do significantly better evaporates.
Once the time comes to invent something truly new, it's the end of Star Trek, and a fundamentally different fiction takes its place. Conversely, before the invention is made, it's not Star Trek yet.
Timo Saloniemi