not really; just speaks loudly about the people who participate in the hard gaming forums. I'd say the whiners in this forum and the rest of the world are the minority when it comes to the diablo community 5% or less.
There are enough people "whining" that Bashiok came out of the woodwork and admitted their end-game content was junk and that, since this is not WoW, they couldn't be expected to pump out new content every couple of months (funny how they couldn't pump out a couple of months worth of content either).
I frequent a number of forums, large and small, and pretty much all the Diablo threads/sections look like this one: tons of complaints, more Auction House "strategy guides" than theorycrafting threads about skills/builds (even on forums centered on D3), talk of quitting, and a large number of posts/threads regarding fixing mf/gear swapping/gear stats/drop rates.
I too didn't think much of people dropping the game until all the irritants and disappointing factors piled up and I thought "I don't even want to play this anymore"...so I didn't, and I spent thousands of hours playing D2. I played D3 for about 150.