The 3 biggest improvements he has made have been his Angles, he was horrendous at that at the start of the season and even last year with the hawks, he would get beat regularly on long shots, it hasnt happened in quite some time.
2 blocker side, it was a weakness now its a strength, he had Nabbyideous blocker side early in the season. But that is no longer a problem
3 rebound control, it went from being a ECHl call up react to the shot late and spray it leave it in bad areas horrendous. To putting it in corners or controling to where he can smoother it.
Getting in to training camp late probably hurt too, but those are the 3 biggest improvements, also the defense has been huge with the adjustments they have made as well.
from what I've seen, I agree with all 3, but this is the biggest. He's still leaving juicy rebounds but the sharks D has been SO good at preventing second chances. This is part of the development of the top 6. They are controlling the front of the net nicely and niemi is excellent at stopping pucks if he sees it, and so far, I think he has pretty well. Could bode well for the PO's that niemi seems sharp, the D is playing quite well in their own zone, and the team is getting enough (still not alot, but enough) scoring without the 2 highest paid guys on the team. Torture part deux!