I think its just how they proportioned it.
As others have said, if the menu size bothers you and the character select screen bothers you, change your UI scale to 65%. However, its a tradeoff because your in-game action bars are going to be much smaller. The pre-patch threw all the proportions and scaling off.
The scale at 100% makes the menu extremely big and in your face, which I am not a fan of at all.