Oblivion (1994) is a terrible movie. And it technically takes place in the future, which I try not to include as Weird Westerns or else the definition of "Western" becomes a bit vague (I believe Space Western is a separate genre). But this really is just a Western with aliens (they don't go into space), so I'm including it.
Also, this movie has George Takei, and the writers really took advantage of that. They gave him lines like "Jim, Beam me up" while drinking Jim Beam, and "great Scotty!" when surprised. I guess he really needed a paycheck in 1994.
Here's a trailer, but honestly, I wouldn't recommend watching the actual movie. RiffTrax (the guys behind Mystery Science Theater 3000) made their own audio commentary for this movie which makes it bearable. Plus that's the version available on streaming. You can watch the RiffTrax version of Oblivion on Tubi and Pluto. I should mention there's somehow a sequel to Oblivion, called Oblivion: Backlash which also has RiffTrax versions on Tubi and Pluto.
I dunno if I'd go so far as terrible. But it's pretty damn bad lol.