I got a few.
Sand Serpents was one that I recall watching a long time ago as a rental. The premise itself was pretty bizarre, with American forces battling the Taliban when the titular monsters show up and start terrorizing the two former factions. It was more weird than outright bad, but I still recall not caring for it too much.
Grizzly Rage was another one of those 'rental watches' from the distant past; it was essentially about a bear killing a bunch of teenagers. From what little I recall of it they didn't even show any on-screen kills, instead opting for cheesy blood effects that covered the screen. Needless to say, even my younger self wasn't impressed.
Like I said before, it's been a long time since I watched both of these, so I'm not sure if I could find any enjoyment out of them now that I have gained a certain appreciation for 'So Bad, It's Good' films over the years. However, even with that taken into account there is still one more film that I can't in good conscious defend: Grown Ups 2. When I first watched it, I was like, "Okay, it's not too bad.". On a later re-watch however, I couldn't take the juvenile humor and just how cringe-worthy it was in general.