To answer the subject line question... yes.
Let's see... Brannon Braga doesn't understand how evolution works and thus the main thrust of the story is just silly. You don't just poof and evolve into something for the hell of it, it's a process of natural selection. Outside forces dictate evolutionary progress. Might that mean evolving into lizards having sex in the mud? Maybe. But not just because he went really really fast in a ship.
Then there's the simple problem of this episode solving the entire problem of being stuck in the Delta Quadrant. They *CAN* break the Threshold, they just turn into lizard people... a problem the Doctor is able to cure. So heck, do it for a few seconds, pop out in the alpha quadrant and then have the doctor fix everybody up like he does to Janeway and Paris. The hamfisted feeling of "there's just some places man wasn't meant to go" at the end is ridiculous. As stated in the episode (if I remember correctly) all they needed to do was figure out how to steer. The only negative thing that was seen to happen was reversible by the end of the episode. But it's never even considered again. Lame.
On top of it all, I just feel embarrassed for those acting in this episode, especially Robert Duncan McNeill who is clearly trying his ass off to make something out of nothing. Same goes for Kate Mulgrew.
Overall a crap episode. One of the few instances I agree with Brannon Braga on a Trek related issue, heh.