From PWInsider.com:

This week's edition of Raw did a 3.9 cable rating, it's best number for a non-special since April 2, 2007, which was the show after last year's WrestleMania.

It certainly appears that curiosity from The Royal Rumble and John Cena's return spurred on the growth from last week's 3.5. The Cena factor is certainly borne out in the numbers as the first quarter hour of the show did a 4.31 cable rating, which was easily the best of the broadcast.

Overall, the first hour did a 4.05 while the second did a 3.69, so the only negative in the number is that they lost viewers as the show went on.