What I totally dislike is that I don't see any roots at some of the trees.
So they seem just to be stuck into thte ground.
Here's an good example
http://skyrimguild.com/wp-content/uploads/2011/02/SkyrimTrailer1-1.jpg
You're actually right.
I'd like to see a game (for a change) that connects between landscape and models in a good way without the annoying cutting edges.
I thought it could happen here due to the dynamic snow and weather feature. But I guess it won't this time...
Oh, and don't worry, I do realize how hard it is to implement. If it was easy then people would've done it already...
Nonetheless, I'd really like to see some roots peeping from the ground, blending with their surroundings nicely.