Like car mechanics, cops, and girlfriends, some are good,some not so good. Remember rule #7: Owning equipment does not necessarily mean that you have the slightest idea of what to DO with it....
Had the best experience possible, last week. The soundguy, Mike Kahrs, actually came to a gig BEFORE we played his stage, so he could "get" our sound, and find out when to boost solos and b/g vocals.
If you ever play Genghis Cohen in Hollywood, when the sound guy Randy is there, you'll get the best mix that money can buy. Amazing, too; all kinds of different of music parade across his stage, and I've never seen him give a "bar mix" to a single one.
Cheers,
Cowboy