The thing in Skyrim is you can tell what is alive and what isn't by the Search feature. A draugr you can search right away is a dead Draugr, a Draugr that you cannot is alive. It's mostly accurate.
My solution to make the Draugr scarier, is to give all the Draugr's a search feature. That way you don't know which one is alive and which isn't. Think about it, you harmlessly fight a swarm of Draugr, but a few remain still so they must be dead. You go to search their body, pickpocket the dead, and it grabs your arm or begins to stir. Boom kind of freaky I thought he was dead moment.
Next is to give them some freaky sounds. Zombies were scary because they made horrible sounds, the squishing of their flesh, the decaying flesh falling off [draugr are to pretty in this sense. more like mummified remains.], the moaning and the breathing. It just kind of added something to me, always made me worried to go into an Oblivion dungeon. Actually I went to go do some quest in Oblivion to assisinate the guy who laughs at us in the beginning and there were zombies in the old tunnels, dread zombies. My assassin character ran through sneak around them and didn't engage in battle with them because they just scared me. [I'm man enough to admit that]
The Draugr do not have this atmosphere. The breathing. The moaning. They squish, yes, but they aren't scary. They need more atmospherical sounds. Like there are Draugr who walk around, how about they have kind of like a raspy breath? Something that prickles the back of your hair as you walk through the dungeons.
Draugr need to go to 101 lessons of being scary.