Boy, and people say I'm a grump.
Can only suggest that you stay out of the Hofbräu tent, which is clearly the "worst", but nothing like as bad as what GG makes it out to be.
I've been going every year for a decade and have never seen "Germans pissing where they sit" - Brits and Yanks acting like drunken school girls, yes, unlike most of the Germans, those over 25 at least, who know that the Wies'n is a celebration of Bavarian tradition and treat it with some respect.
The food can be great, if you know where to go, and the beer is, of course, the best in the world.
11 days until the Anstich! Can't wait.