Isn't that true in general, 80% of tv is crap, 80% of photography, 80% of twitter/tumblr is crap, 80% of music is crap (country!), 80% of every human endeavor is crap.

Indeed: http://en.wikipedia.org/wiki/Sturgeon%27s_Law

Not necessarily. 80% of anything might be crap for you but much higher than 80% of anything is not see as crap on the whole. You might hate country but tons of people love it.

Contrast with crappy domains: they are crap for everyone except may be the owner.

Yeah, I was invoking Pareto. In other words, amazing how an apparently arbitrary sample ("domains with 2 letters"), as opposed to a random one, reflects the population's crappiness.

80% is probably on on the low side though...

I think you're underestimating how crappy all of those things are with your 80% figure...