In the lounges or the sports bars they show the "BIG" games. most of the time it is sports from other countries, not American ones.
They also show everyone enjoying the trip so you will buy their video for a souvenir.
We sailed the Carnival Holiday--had CBS, ABC, NBC, a channel that showed movies not yet on video (we had Girl with a Pearl Earring, Something's Gotta Give, House of Sand and Fog, Big FIsh and something else), a travelogue channel, and another channel that showed ship activities. No MTV, no Disney etc, but being able to catch Survivor was good, and it was suprising to me that we could.