Watching them play isolated hands won't help you though. They only really show the big hands where someone makes a big bluff, doubles up in a race, or where there are two + big hands, not the thousands of hands in between where the blinds are just picked up(another reason why bad players feel the need to play damn near every hand, because that's how they think they see the pros doing it). Also, in those big hands you are just seeing what they are doing based on a extremely tiny portion of information, so it really isn't helping you. You don't have any of the information on probable reads, whether it be visual or mathematical(bet sizes and such), which in most cases is the reason that they make a big move. This is one reason why so many people playing at the lower levels make such terrible plays... They see someone on TV overshove bluff with 72o and win the pot, so they think they can do it now, not taking into consideration all of the other things that were going through the player making the play's head.
Now if they had more player commentary afterwards and had the players in the hands talking about what was going on, what they noticed and why they made exact plays, then it might be more beneficial. Until they do that, watching poker on TV really is going to do about as much to help you as watching football on TV in your quest to be an NFL star when you've never played.