I know this has probably been suggested before but here goes...
It might just be me but I find it seriously annoying that you can't see how much mana the other demigods in the game have left, and it would seriously benefit your decision about charging Unclean Beast alone if you could see that he just purchased the "All Fathers Ring"
Maybe its just me having played too much DotA over the years, that you expect these things to be viewable, but it does give the game a more strategic edge, that you need to counter whatever the other team lines up against you... thats what strategy games are all about...
But its kinda hard when you don't know what to counter against... 
Anyway, I just think it would improve the game and the gaming experience if mana bars and items were viewable on the other Demigods in the game