There were elements of this episode that I liked. A cyborg bounty hunter was cool. The Old West setting? Very nice. The wishy-washy nature of the alien experimenting doctor? Err, no. And what the hell is up with the barrier around the town? Really? Argh, no.
While I can suspend my belief about a lot of things, the whole conflict could have ended early if the Doctor hadn't gotten himself distracted by the bright white alien egg ship. Yeah, this episode is definitely NOT going to be I'll watch again.