aka Las Vegas Hillbillies, aka Country Music, U.S.A.
How bad is it? About 1960's TV variety show quality.
Should you see it? If you're a fan of anyone in it.
Ferlin Husky wants to be a country music star and inherits a run-down nightclub/casino in Las Vegas. Mamie Van Doren and Jayne Mansfield are both in it, but refused to be in the same shot. Richard Kiel has a cameo as a bodyguard. There's gangsters and bikers, but it ends in a pie fight. There are a lot of country songs performed, mostly by where-are-they-now types. It's better than the sequel, Hillbillys in a Haunted House.