My own approach is revenge via YouGov surveys.
Anything with an annoying advertising campaign, such as the Moustachioed Tenor or Michael Winner, or the old ones with a dog called Lucky, I just label as "Poor Quality" and "Poor Value for Money".
I'm not just being vindictive- but that is really the impression that the ads give me- that of a really tacky company. Needless to say, I never use those companies.
Any advertisers on here (a remote chance, I think) please take note.
Cheers
Dave
P.S. Isn't it odd that all those examples are insurance companies? You would think that a more responsible image would be what was required!
D