Gonna go with some big name games because that is kind of the point here. Ill start with some older games i hated and finish with the more recent games i regret buying.
Persona 4 - Why people like this game is beyond me. It is slow paced, the battle combat is boring and the music is god awful and it takes like 5 hours before anything actually happens on this game. The "life to battle" cycle is too short, leaving you no time to do anything meaningful and get settled in to the game.
Need for speed: most wanted (The new one, NOT the original) - Single player is beyond awful. Multiplayer saves it for a while until you start to realise its the same stuff being repeated and once you know the tracks and goals, it loses ALL appeal.
Mario tennis open 3D - Too simplistic, it is effectively an arcade game. Is it too easy in general and there is no way to try and turn it into a more normal style tennis match because it forces you to play with those stupid powerup things on the court.
Project X zone - God knows why i bought this, it is being kind to call this a stratagy game but thats what it tries to be. What it actually is a bunch of popular video game characters who move around and do flashy moves. It becomes repetative about 10mins in and never changes. Dont buy this.
Toukiden: age of demons - I want to like this game but after 20hours, i dont wanna keep playing. The customization in this game is lacking, the mitama's arnt varied enough to be interesting, there is a very limited number of bosses and beating them is not challanging at all. This is just a hack and slash game that gives you multipal parts to aim and break. I bought this game hoping to find a game that was as addictive as Monster hunter or soul sacrifice was, i left disappointed.