I like Nurse, and I expect good things in his future. He's clearly an NHL defenseman with considerable potential that, since last season, he's beginning to realize.
That said, he's been on the ice for more goals against his team than for his team for 4 years in a row and counting. The issue, of course, is that the Oilers lack depth in all areas (except maybe center) and are forced to overplay Nurse in situations where he isn't necessarily ready or best-suited.
But anyway, I like his skating, his offensive up-side, his toughness, and his level of 'compete'.
The niggling problem with Nurse is simply his hockey-IQ, which is kind of average. He doesn't always process the plays at full speed, and he frequently makes poor decisions at key moments.
He's just turned 24 and he (over-)plays for a thin team. I think we'll see Nurse at his best in about two or three years, hopefully still as an Oiler.