I'm sure they step up there game in hard.
That's actually pretty normal in normal difficulty settings in games now a days, seriously in Smash Bros. Street Fighter 4, Street Fighter X Tekken ect. the CPU is a joke, you have to put them on at least hard to get any challenge out of them.
as someone else said, buying for mp both online and offline. stories are nice and all but c'mom...cut the crap.. nariko vs kratos is waiting to happen...oooh oooh...parappa vs sackboy
It's on Legendary. If I remembered correctly, then unlike every other game that has a legendary difficulty, this game's Legendary is between Easy/Normal and Hard. Confusing, I know.
Maybe its like easy-normal-legendary-allstar.