Presumably, you've never taken the Heathrow Express? That is a train journey that is always better than a car. The Gatwick Express, not so much.

As far as I can see, the Gatwick express is mostly an excuse to rip people off. Last time I was there, there was a normal train to Victoria for about a third the price, which took literally two minutes longer. Is there a tourney for which the Gatwick express actually makes sense?