What makes a good commercial?

First of all a good tv commercial schould grab human interest. Commercials need to spark the audiences interest.
It's very important that the audience watch your commercials eagerly because there is high probability that their catchy slogans will for sure embed in their consciousness.
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Secondly you must show off with the product. Boast about its unique and exeptional character and what's more you have to prove that it will change your customers' life for better.

Finally we go to a style. Humour is good, only if it's funny. You want to sell the product not boast about something completely different.