crappy pc converts for consoles... simplified, gameplay changed, removed parts of the game etc...
released buggy half asses unfinished games, that you need 10 updates before its playable...
100 useless button mashing/keyboards combos to 100 diffrents sword/fist/gun/strategy etc, when you only need 3 and you cant remember the rest anyway....
insane hard game bosses, typically a game that have nothing going for it. and desperatly need to make the playing time longer.
singel player games(rpg games specially), that could be easly done (2-4) co-op online. but instead you have one or more useless ai character as companion.
releasing singel player games in 2011. gaming is a social affair it is not the ps2 90's anymore. co-op online is where the fun is. every game should have an option to play it through with a friend.
the 'no time to put in the game before release' excuse. then sell it as an expansion/dlc to cashin more on the game later. (new maps/more levels/new guns etc)