In all the hoopla over Canyon, Stadium, and even Lagoon, lest we not forget that Valley is now one of the most beautiful environments ever*! That block selection!
That atmosphere! 
Paved forest roads, massive height changes with new dirt blocks, trains!, lights in the carparks, dynamic mood changes (okay, that's not Valley only, but it looks so good in Valley!), viaducts, water splashes with sound, and all the little blocks that just filled out the environment to make so many more block combinations possible.*Lagoon looks very pretty too.
And thank you for mowing the grass Nadeo!
I'm also glad to have more room for embedded objects (1MB), and faster lightmap computations. And even though I didn't have a huge problem with it before, I know many players did.... performance. Valley can now be driven with a decent framerate, which means more players can enjoy it!
And the gameplay, wow! Dirt is so much more fun now, and it feels so fun to play RallyCross style tracks on Sand and Castles. When you nail a good slide on a Castle wall or on a Viaduct, there's nothing quite like it! Such great fun!!!
It's really a whole new environment to me.
Honestly, I always enjoyed Valley, but now it's easily moved up to top spot as my favorite.
GG Nadeo!!!
Come on people! Valley hype!!!!!!
