Disclaymer: I don't realy wan't to be mean or treat you unfairly, everyone has the right to it's opinion.
With this said, i have to think that you were either extremely unlucky, or you don't have much knowledge in PC software to have your system in top shape or you aren't realy experienced in past launches of RPG PC games to have a fair base of comparision.
As just a couple examples, I couldn't play diablo 3 for nearly 2 weeks after launch. I couldn't play Skyrim for nearly 1 month after lauch because it had so many documented bugs that still today in order to play the game we need an unnoficial fan mod.
For D:OS i only had 3 problems, and all of them were fixed in little over 24 hours after world launch:
a) My sound was weird, kinda "echoing". Now its better. It was not a game breaking issue.
b) My kickstarter rewards were not available in my install. I kept playing normaly and 1 day later they apeared in a patch
c) The NPC excessive chatter (voice dialog) was repeating way too much and driving me insane - it was fixed the next day via a hotfix/patch
For what i can see in steam forums (the world-leading QQ factory in PC gamming discussions) the major issues were DLC not apearing (fixed now), game saving issues crashing the game (fixed now by disabling steam cloud saving) the forest crashing bug (fixed now by hotfix) and the GOG version messing up (I believe it's fixed now but can't confirm). The rest is just normal stuff that every game has, the ocasional bug and crash that will be fixed soon.
Quite honestly i believe that the launch was well managed and the biggest issues were resolved less than 48 hours later, most in 24 hours.
In fact it all gone way better than I anticipated because a week before launch everyone at larian looked like a headless chicken in panic of launch day

With this said, i wanted to congratulate larian again.