Awful. A complete waste of money.
There are plenty of us here who make a living for ourselves and others by driving large profits through AdWords, so a statement like this should always be viewed as a personal experience (which I am sure is how it was meant to be interpreted).
There is of course a learning curve and the comment about conversions is so true. Read widely, experiment, learn, improve, and with time you could be attracting the sort of levels of leads that you never dreamed of. And yes it does work for B2B such as air conditioning.
The White
[edited by: eWhisper at 1:59 pm (utc) on April 28, 2006]
[edit reason] Please don't drop sigs. [/edit]