'Rob' was a never a huge hit for CBS, it's series premiere was watched by over 13 million viewers, but dropped down to nine million by the end of the first season.
Here is the break down of the aired episodes:
Episode 04 - Family Secrets - February 2 - 11.06 million viewers
Episode 05 - Rob Learns Spanish - February 9 - 10.74 million viewers
Episode 06 - The Baby Bug - February 16 - 10.65 million viewers
Episode 07 - Romantic Weekend - February 23 - 10.33 million viewers
Episode 08 - Dad Comes to Visit (Series Finale) - March 1 - 8.99 million viewers