The 2012-13 TV season officially ended Wed. and the final ratings show that NCIS is the #1 most watched show in the US, followed closely by NFL football and its own spinoff series NCIS LA in 4th place. The Big Bang Theory is the #1 sitcom checking in at #3 overall in total viewers and #2 in the 18-49 age group behind football. The top sitcoms break down this way:

Rank by total viewers (18-49 rank)

3. The Big Bang Theory (2)
10. Two and a Half Men (9)
16. Modern Family (4)
30. Two Broke Girls (14)
34. Mike & Molly (25)
42. How I Met Your Mother (15)
45. The Middle (44)
49. Glee (26)

2012-13 Season Final Rankings (http://www.deadline.com/2013/05/tv-season-series-rankings-2013-full-list/)

During the 2012-13 season, NCIS became the first scripted broadcast TV show in 8 years (since CSI in 2003-04) to take first place among total viewers.

During the 2012-13 season, NCIS became the first scripted broadcast TV show in 8 years (since CSI in 2003-04) to take first place among total viewers.
I don't like NCIS at all, but I am sort of really glad this happened.