I don't think there's enough diversity of trees in Skyrim. For having such a small map, I would think this would allow more work to go into making things less generic, more detailed, less sparse, etc. And this screenshot doesn't look that great to me:
http://cdnstatic.gamesas.com/akqacms/files/tes/screenshots/DragonMountains_wLegal.jpg
What doesn't look appealing is how distant the trees are from each other, how all the trees look alike (opposed to having diverse trees and shapes) and how there doesn't appear to be any foliage between them. It looks terrible quality. Relating to this screenshot, the misting and blurring of the scenery isn't helping create a more 'realistic' feeling world. The dragon looks very appealing and 'realistic' though.
In high altitudes, trees grow like that. They grow sparse, and the land is barren... I am born and raised Alaskan. I've spent a lot of time around them.
Also, I think a lot of people are confusion hemlock with pine... they are both conifers.. but in Lake Mountain, Wolf Heals Mace (far left tree is defiantly a hemlock), and Orc Night (to the left of the Orc) all have hemlock as well.
Now if you want a tree that looks the same almost every time... it's hemlock....
My big thing is that they didn't repeat the same meshes over and over and over. There is some difference in where the branches are... YES!!!!!! Huge win for that.
Personally I love where the trees are. Real life isn't HD, and I don't think HD foliage is a good thing. Same with distant landscape. My eyes can't see HD that far away, so I actually don't want my game to do so as well. Heck if they did put HD distant landscape I would turn on depth of field so it blurs a little.