The game is okay, it's still the same old Trackmania. But so far I can't figure out where the "2" comes from, it's basically just TMUF with one environment. I was expecting a bit more from it, but it's possible there is something new in the single player side which doesn't work on the beta yet.
Regardless the new environment is fun and the graphics are great (though lack of proper AA support really sucks), but 20e is a bit much for what you get when you can buy TMUF for 10e with 7 environments.