EXP Share has not distributed a single point of xp to any of my other pokemon. Now I just have one guy that attacks stuff and as soon as he dies, it's a wash for the rest. Yes, it is on in the menu.
I was really enjoying it up until the 3 block puzzle and the block kept getting stuck on the door and wouldn't move... A couple of strange interactions with ladders threw the controls out sometimes too. Pretty enjoyable overall.