I would say it depends on your trading style and personal preferences. I`m a day trader and I prefer to either keep it quiet or listen to music. I don`t see how CNBC would help me place trades on a five minute chart. I`ve heard they have hot reporters though
In the long run it's usually a good idea to go short when everyone on CNBC is bullish and load the boat when everyone is bearish. If market is up they are all bulls. If down they are all bears. they change their tune with every closing day the market has IMHO