..., Roseanne is No. 3 in total viewers

http://deadline.com/2018/05/2017-2018-tv-series-ratings-rankings-full-list-of-shows-1202395851/

The Big Bang Theory averaged 18.63 million total viewers, making it No. 1 for the season. Sunday Night Football was No. 2, Roseanne No. 3, This Is Us No. 4 and NCIS No. 5. Freshman shows Young Sheldon and The Good Doctor ranked sixth and seventh, respectively.

Lessons of the 2017-18 season: Shows that were surprisingly renewed last year were unsurprisingly canceled this year (https://www.buzzfeed.com/kateaurthur/winners-losers-tv-season-roseanne-fox-nbc)
In examining "the many losers (and few winners) of the TV season," which concluded on Wednesday, Kate Aurther points out that shows that shouldn't have been renewed a year ago were pretty much all axed this year. "Last year, Fox should not have renewed The Exorcist and The Last Man on Earth; ABC should not have renewed Quantico and Designated Survivor; CBS should have killed Superior Donuts; and NBC should have canceled Taken, Shades of Blue, and (haters, get back!) Timeless (the fate of which for Season 3 we still don't know — possibly because NBC executives are scared of its fans like I am)," says Aurthur. "Now, all of those shows (except for Timeless, as of now) are gone. Lessons learned, right? Wrong: I can see the future, and in the future, people will wonder why NBC renewed A.P. Bio and Good Girls, and ABC renewed For the People."