Doe anyone else think that the stealth damage arrow attack sound effect is funny rather than deadly sounding?
It sounds like your foe's been hit over the head with a frying-pan. I was in Broken Oar Grotto picking off robbers and I could hardly shoot straight at one point for a giggle attack. Another thing, no matter what armour I'm wearing it sounds to me like I'm leaping about in rubber boots.
Sounds of Skyrim is a mod project on steam to help with the sound effects. Currently it consists of two mods (dungeons and wilderness). It doesn't address the problems that you've mentioned (at least not yet - we can hope); but when you're underneath a wooden roof and hear raindrops hitting, it really helps with the immersion.
What also annoyed me was the incredible loud noise I heard everytime I did a sneak attack on someone. Since I played an assassin style character I heard it all the time and it made me mad. Eventually I modded a mod so this noise was gone and I was happy again. Bethesda shoudn't have created that noise.