Considering the utter garbage which has come from the SyFi Channel in the last few years, this movie was quite pleasantly surprising.
The plot was reasonably fresh and mostly logical. The actors delivered acceptable performances. The outfits were good. The setting was quite acceptable and looked like the northwestern U.S. CGI, if not great, was at least better than typical SyFi fair. The ending was, of course, predictable, and left unanswered questions.
A nice point was that the mandatory scientist (Jules) was not the typical all-knowledgeable font of information. Although he did make a few statements which included knowledge which did not yet exist in 1890, along with some that were just plain wrong; this role actually made fairly good sense within the situation.
There were a number of questionable items. The female bounty hunter is not something which would be likely in 1890. Many, but not all, of the firearms where very clearly modern. (Does anyone who produces movies ever listen to someone with knowledge in this field?) Finally, the repartee between characters who are opposed to each other before the arrival of the "invaders" begins to strain credulity.
Altogether and unexpectedly, this was a movie worth the watching.