I wouldn't keep the overlays open, maybe just open them 2-3 times during the game when there is a break in action to review the stats. It just takes too much of the screen when it's not a 1v1 game.
I've never actually played 3v3s or 4v4s, that map looks really nice in terms of graphics, great lighting imo.
Yeah, its "nice" to have all the info available but its sure fugly to look at in big games.