How bad is it? It's a 1959 horror movie made 40 years too late. With CGI.
Should you see it? If you're in the right frame of mind, this can be fun. (Mild thumb's up)
Genetically altered bats attack a small western town and Lou Diamond Phillips has to rescue them. There's not a lot of time wasted on preliminaries, as the film expects you've seen films like this one before (and you have), so it's on to attack scenes, which are largely CGI clouds of bats that attack in a murk that's hard to make out. The close-ups aren't much better. There's a couple of decent scenes and the ending has plenty of action. It's nothing special.