what % of home inspectors are lousy?

[Scott W.]

I've noticed some of these guys are morons. I had one about 10 years ago that supposedly was licensed. he took about an hour to do the inspection. flash his light in the crawl and attic.  didn't check all windows and didn't bother on the furnace (it was in july and I replaced it in the winter as it was beyond cold in the home).

so, it got me to thinking, what % are not to the level they should be? licensed and takes 2-4 hours to do a home inspection, depending on the size of the home?

my guess is 50% suck.