You mean “so bad it’s good” (laughably bad) or movies that are purely entertainment value and not “actually” good?

I already did a thread on the former and as for a movie I know when watching it isn’t good, but can still have fun with. G.I. Joe: Rise of Cobra and Commando.

Anything from Bollywood. Literally.

Which immediately tells us you have no clues about Indian cinema. 

I don't claim to be an expert, but I've seen my fair share. Plots that go in a million directions, sudden jump cuts that make absolutely no sense, thirty minute arcs that are stretched out to a billion hours because every five seconds, everyone must dance, dance, dance... and all of it done on a what appears to be a five-dollar budget. Oh, and did I mention the obvious plagiarism?

I always know I'm in for a treat whenever I load up Netflix and Salman khan is gazing at me with one of his four possible facial expressions.

Rise of Cobra is OK, but I like the sequel Retaliation much more. (Not the Snake eyes reboot.)

Commando is one of top 10 Arnold films.

Mortal Kombat (1995), the very first one, Billy Madison. Maybe Van Helsing (2004), it has a bunch of problems and could have been so much better (should have been a big franchise), but it's still fun to watch. I know people hated X-Men: The Last Stand, but I kinda enjoyed it, but then again I'm not hyper picky on X-Men films.

Mortal Kombat isn't even bad, it's pretty much best game movie ever.
Van Helsing is one you can enjoy, like a less serious version of League of Extraordinary Gentlemen. There's also an animation, but that's not that good.
I disagree with most people about X-Men films. First Class is my least favorite (not having see the last), while I do like Last Stand and Apocalypse and think X2 is rather boring. I only agree with public opinion that first film is OK and DoFP great. I think with Last Stand it's that it's not good seeing for first time, but after seeing the movies more than once, Last Stand is among the more rewatchable.