I actually remember games being released with no significant bugs, which everyone was able to play from day one without a patch, without a problem. There were companies "back in the day" renowned for not shipping anything that had bugs in it. Some companies built their entire reputation on the quality of their releases.
Sadly those days are long gone.
Mostly because of the amount of gamers who'll accept a load of horse dung and shout at anyone who insists it's not the best meal they ever had!
'No significant bugs'
Yes a long time ago when games where in the kilobytes and that included graphics assets you could release a game with no significant bugs. Even in the age of a game fitting onto a floppy games where released with only minor bugs but how many disks worth of data does ED account for, lets say 6000 amiga/ST/PC releases of that era. I don't think that you could cobble together that many games that have no bugs.
If those days where still here HD's would be a dream SSD'd wouldn't even be on tomorrow's world.
Times have changed i no longer rotate a wheel to make a phone call waiting for it to reset before i send the next number. Things are more complex and as we now get games that evolve over time which is not something we used to get we own an evolving product. which if you had told me about in the 80's i would have thought it was better than science fiction. Comparing a bug free game like Manic Miner to ED is unfair, even the succesor to MM, Jet Set Willy was released with bugs. So some gamer's want to live in an age where everything is perfect and no games need patches, I fear these are the luddites of the modern age. Screaming and raving about how modern games work and evolve past launch and how things where better before when you bought Altered Beast or Megatraveller I/II that was it. Nothing really changed.
I would love to have a game released with no bugs and working on release day, but I'm a realist, So many factors involved just on one platform. As long as a game is evolving and improving I can and will accept glitches as long as I see the developer continuing to work on problems.
When I've found a bug in ED and gone looking on the forum, i've found it there already logged and last time it had a message that the fix would be applied in the next patch. Which I thought was pretty cool. We can have massively complex games like ED warts and all or anyone fancy Rainbow Island? (dargh not a good example it had bugs but still a cool game!)