i actually LIKE terrible games (well, the ones with interesting aspects to their badness), but sometimes you run across games that make you go at what's going on... for example:
danger girl- a horny fanboy's dream does NOT a playable game make. this game makes any andy sedaris film look like return of the king. it does such a good job of thrusting polygon t & a in your face that it makes you immune to the real thing (well, that's what i've heard)...
steel harbinger- in the future, the world will be saved by a half-naked cyber babe who walks like her thong is too tight AND her heels too high to move, while enemies respawn on all sides and run in front of the occasional hostage that you have to save, causing you to shoot them both. well, at least a sequel wasn't made...
excalibur 2555 A.D.- the REALLY poor man's tomb raider. featuring perhaps the most unattractive female character ever in a ps game, klunky action sequences, and some really interesting voice acting that sounds like a bottle was passed around during the v.o. sessions. one of those games where if you don't pick up a certain item in a certain spot, you're screwed forever and have to restart from the beginning...
o.d.t.- sort of the cosmic twin to the fifth element. poor in every aspect, the game just feels so rushed that even when (or if) you get used to the twitchy action and platforming, you'll still run across enemies that make you want to stomp all over your ps one controller.
planet of the apes- the dc version was killed, but this snuck out and stunk up the cage something awful. not as awful as the remake, but when the best thing in the game is the title screen, you're in for a real "treat"...
psybadek- a futuristic snowboarding platformer (!) by psygnosis that i don't think i recall anyone ever finishing because of the mind-popping, goofy level design and pesky enemies.
largo winch- even the title is bad. it's a stealth/action game with no action or stealth that actually works very well, and yep, that's the main character's name (largo=big, i guess, so he's got a big winch? making this bad joke was the ONLY fun i had with this game)
sentient- great idea, really sloppy excecution. i'd actually like to see someone do this idea over with much better visuals and some actual reliable control scheme...
bug riders- ummmm... riiiight. break out the raid. a racer where you can only move forward, and turning requires whipping your ride like it's a leather-covered VW beetle with a bad transmission...
nightmare creatures 2- take an ok original game with repetitive gameplay and make it worse by turning it into an even more mindless button masher with no plot. the dreamcast version looks like it actually uses the playstation assests and adds texture smoothing and more filtering.
overblood- love the title screen/intro, techical stuff like the switchable camera angles and some of the gameplay ideas. but the monsters look stupid, the characters can't run worth a damn, and at one point you can click on and get killed by an armless, legless statue! the hysterical thing about that last part is in the much better sequel (overblood 2, which has nothing at all to do with the first game), there's a statue in that game as well as an in-joke to folks who fell for it in the first game. when you go to look at it, if you click on it, it falls and kills you as well!