Most of my SF TV/movie watching is guilty pleasure because so few Science Fiction films are actually any good (or even Science Fiction) but the one I'm MOST ashamed of enjoying is Jason of Star Command which is so incredibly, cacking awful on so many different levels it transcends time and space and any attempt at critical analysis.
Movies? Starcrash most of the guilt here is because I think the best thing about it is Caroline Monro's sweaty tits - I kind of feel guilty about watching a movie purely because the lead has nice knockers and knows how to point them at the camera.
Reading: The Perry Rhodan books.
Comics: Alan Class reprints of all those those 'Twist in the Tale' stories (Oh MY GOD! It was EARTH ALL ALONG!) that Stan Lee churned out by the thousand back in Marvel's early days in titles like Tales to Astonish.
I have Jason of Star Command on dvd and it's a motive joy to watch !
Yes, Caroline Monro is the best special effect in Starcrash .