While it is obviously good programming work and presumably useful for some people, the stats box reduces my enjoyment of the game.
I like the clean simplicity of the graphics, from which I can enjoy the feel of the game; boxes popping up as I move the mouse ends up detracting from that feel, and makes the whole thing feel somehow like I'm filling in a form rather than casting spells.
I am honestly surprised how much less fun this makes it; I've really been enjoying the game overall, and usually appreciate changes in the new versions, but I haven't enjoyed any games since the stats boxes started appearing.