for me was brawl and twinlight princess.
brawl because single player was suppose to be great made by kh history designer, it was only 8 hours, after it its pretty much just another party game.
twinlight princess, they made you waste alot of time going to side to side of hyrule... to make find a long version of ocarina of time ending battle, and ganon even didn't put effort to the last battle, he died standing bored.