As for the acting... well, Karl Urban did great, there is no denying that. One is left with the impression that Urban takes every acting gig quite seriously, and always gives the best performance he can. Walter Koenig, on the other hand, really showed his age in this. He wasn't bad, but neither was he particularly memorable. Frankly, he looked like he really didn't want to be there, and had perhaps been snookered by his agent.
If the show had been blessed with a bigger budget, it really could have become quite popular... although seeing how eager the powers that be are to cancel good sci-fi shows like "Firefly" and "Farscape", who knows how long this one would have lasted anyway.