Lazy and dull?
This is a game where you can piledrive helicopters into people. It's a game where you can summon a robot Cthulhu to come and destroy your enemies. How the fuck can any game like that be dull?
Problem here is Yahtzee got two wrong assumptions, and ran with both of them.
1) 'It's a sequel to Madworld'. No it isn't. Just as it isn't a sequel to Bayonetta, despite having Bayonetta in it. It's a Platinum games that uses some of their established characters to round out its roster and provide it with a bit of fan appeal.
'The single player is worth a danm'. Anyone who knows anything about this game knows that the real draw is the multiplayer. They've taken a brawler, tried to combine it with online deathmatch a la COD, and by the response so far have managed a pretty good attempt of it. Who cares if the single player isn't as good? People are buying this game to piledrive helicopters into each other.
Seriously though. Yahtzee compains about how all games are becoming brown, gritty and predictable, then the minute a legitimately colourful, insane, creative game comes along, he calls it 'dull'. Kind of makes wonder why developers even bother...