Well I enjoy the game, especially the enemy juggle attack which leaves me pretty well prepared for most boss battles since most of their attacks are aimed to the ground. I beat the main game on my own. I just needed plenty of sammiches and potions and I was fine. I played once with my brother and like all things shared with my bro, it became a stupid contest to see who got the most of this or that, or he'd steal food to heal myself when he didn't need it, which I got tired of dealing with. I'm sure it will be the same with anyone else I play with.
Oh well sucks about that, my friends and I are more of "Let's see how fast we can beat the game and be awesome!" than "I'LL BEAT YOU, YOU FGT!"
I beat the game by level 25, me and my partner.
That's very easy to accomplish, but try Insane mode and you'll see what I mean.