Those three pictures really doesn't do justice for the previous and current versions of AH2. The only reason the AH1 pic looks great, is because Widewing caught a great 'photo-realistic' angle shot from a player-made terrain using player-made textures. For those of you who hadn't seen AH1, trust me, it doesn't look that good. Especially, the default HTC made terrains look a lot worse off.
The same could be said about the current terrain. The texture tones and colors should be adjusted, but a lot of the awkward feeling comes not from terrain itself, but from the fact (IMO) that the terrain wasn't really "designed", but rather converted from the old format to new format.
IMO the quick-converted NDisles in the MA currently, probably shows less than 50% potential of what the new terrains can really do if a map was really designed from scratch.