I get that it is annoying that the servers have been unstable. Yes, it sucked to get propelled out of the game just when I was about to have my epic showdown with Diablo himself. But, really, what's the big deal? I turned off the game, called some of my neglected family, did some reading, played some other games and a few hours later the servers were back up.
The thing is, we all know that this is temporary. Diablo 3 ain't going nowhere, it will still be playable a few days, weeks, months or even years (most likely) from now. So relax. This ain't like the people who paid for Rage and got stuck with an unplayable product for months at an end until ID finally got their act together and patched it.
As it is, Diablo 3 is shaping up to get some really stellar developer support after release. Let Blizzard work out the kinks, releasing a game to 6+ million people is quite demanding.