The one that instantly comes to mind is Sonic Lost World on 3DS, a game I'd generously describe as occasionally mildly functional but bafflingly designed. If you play the demo you've played the best part of the game, because everything goes tits up as soon as zone 1 act 2. I stubbornly made it up to the ice zone before I had to give up for my sanity's sake. The amazingly terrible special stages are just the cherry on top of this perfect storm of awful. I'd say it's worse than Sonic 06, which might be completely busted but I was at least able to finish the whole thing.
Honourable mention that has its merits but I didn't enjoy at all: Trails of Cold Steel.
I really wanted to like this because JRPGs are my favourite genre and there was a lot of hype surrounding CS, but the 20 or so hours I spent with it were possibly the most bored I've ever been playing a video game. The plot had no hook, the characters were all either bland anime archetypes or annoying AND bland anime archetypes, and the social sim stuff was obviously only shoved in there because they wanted to do the Persona thing in a game not structured to compliment such a mechanic. I'm cool with RPGs being laid back and slow to get going, since I do really like Atelier and the aforementioned Persona, but all CS did was grind down my patience until I had to give up.
Also, I didn't hate the battle system.