Premiere episodes got great ratings...
From:
http://tvline.com/2013/07/17/ratings-whose-line-is-it-anyway-premiere/
"Whose Line Is It Anyway? sure improv’d The CW’s lot.
Premiering to 2.9 million total viewers, the reboot delivered the network’s second-most watched series launch since Sept. 2011 (trailing only Arrow) and its biggest audience in the time slot since Nov. 2009 — all while batting against the MLB All-Star Game.
The CW also notes that Whose Line scored the network’s best 18-34 demo rating for a premiere since Sept. 2011, and only trailed the All-Star Game in that measure from 8 to 9. In 18-49, the show scored a 1.1."