sometimes its not the buyers fault! Say you love the original game and the sequel comes out and you expect it to be more of the same, you do hear stories to the contrary, but you like the game enough to convince yourself that the game will be more or less the same, but then when you play it, its so different from the original game that you cant help but hate its differences....
E.g. Take multiplayer in Dawn of war 1... it was absolutely timeless excellence, 8 player maps, insane computer difficulty, tonnes of variety in factions. and then they bring out the sequel; dawn 2, which although different, in singleplayer; is awesome...
But in multplayer.... what a piece of shit. They changed so much of what had made the original game's multiplayer awesome, so its not my fault for buying a game i hate, its the developers for changing the parts i love.