I like the ending very much, killing Ygerna !
But I agree the Escort Mission was very difficult and a pain in the *ss ... but after a few "game over's" I succeed (after lowering the difficulty to casual) ...
Hope next time I can do it on hard or even on nightmare
Ygerna was quite tough and got slightly protracted, but I didn't really mind that too much and it was worth it for the end sequence: I liked the camera panning away from Aleroth (shame I couldn't visit the surroundings as was apparently originally planned...)
I also lowered the difficulty to casual for the escort mission; odd thing about it is that I didn't notice a difference between it and Stabbey's nightmare-difficulty video. Maybe I was just looking for the wrong things...