I have loved Nurse's game today, and kind of confounded by some of the comments here, although lots of good too.
Those complaining about Nurse jumping in on offense like that have not been paying attention to the teams game plan. All of the top 4 D have been jumping in like that, and while Nurse has been jumping up much more often, he also seems to be the best at it. Even though he may do it when it is a bit iffy, you have to accept that he is not going to make a high pace read at 100% rate, but the positive is much greater than the negative here.
If Nurse or the other D were not getting the green light to be aggressive about jumping in, he wouldn't be given so much ice time.