I've only really encountered two bugs. One is to do with the water effects. You will see the water but then it will just stop and become clear, so it basically looks like fish are floating in mid-air. The other has only happened a couple of times, when I've sneaked up on people, or creatures, that are sleeping I would sneak attack them, and kill them, but they would fall through the ground. Thankfully none of them were carrying anything important.
It's where those dudes just stand around and wont do shit right? yeah happened to me as well
2. exit game
3. start game
4. load = worked for me
It was something I was doing wrong. Got it working, anyway. The final part of the shout you learn is great. Shouting at some asshole necromancer and hurling them off a cliff or through a wall with your VOICE is as much fun as I expected.
Should be close to finishing the Thieves' Guild now, too. The Nightingale Blade is pretty fucking awesome.