My biggest guilty pleasure is probably Disney's THE BLACK HOLE.
Yes, the science is wrong. Yes characters walk through space without space suits (apparently some were built, but like Alien the suits fogged up and made it impossible to see so they ditched them), yes its clear that they hadn't planned the end, yes no one was fooled by not putting Roddy McDowall and Slim Pickens' name in the credits and yes Yvette Mimieux looked ridiculous in the perm given to her so they didn't have to worry about her hair in weightlessness...
...and yet I love the initial mystery. The ships, the Cygnus and Palomino are great (the Cygnus may be my favorite movie spaceship of all time). The take on the robots is great, with a whole robotic subsociety hinted at. The idea of robotic-human telepathy is a proto-cyberpunk idea (and was Reinhardt driven mad by trying to forge his own connection with Maxmillian?) The cast is top notch late 70s casting - Maxmillian Schell, Anthony Perkins, Mimieux, Earnest Borgnine, McDowall and Pickens, Robert Forster and Joseph Bottoms.
I've probably watched the film every 2-3 years since it came out on home media.