I actually like the new GUI. I don't care about the map transparency because I fly/drive with the minimap, open the map for a moment or just use my knowlege of the map. I still can see it being a problem for people who used to fly with it. The menus look good and I like that they are not stretched. I feel like HUDs in air vechicles are a bit better this way. I pretty much like all the changes except the removal of the mutiny button and number of players in the Caps menu.
Other that those two things, big thanks to the DEV team.