I've been catching up on the show on Hulu and wow, season 2 and 3 have been so much better than season 1! (For me, at least.) What impresses me most is how each episode builds on the last, and tells a season-long arc. It's the sort of storytelling that you see a lot in shorter cable TV seasons, but you rarely see in 22 episode network TV seasons.
I'm a big fan - I originally started off with a huge preference for Sherlock over Elementary, but now the shows have pulled neck and neck for me! Especially since Sherlock's season 3 was a bit disappointing.
Do you watch Elementary?