The interesting part of reading through the various threads Sandy Petersen's tweet spawned is that a lot of people seem to see Quake as the last great id Software game, and as someone who played a ton of their games back in the day, for me Quake 2 was the first great one and Quake III Arena was the last great one.

Of course I'm not trying to claim their opinion is wrong, it is just a matter of what you value. I was very into the online multiplayer aspects of the series (random aside that will mean nothing to most: I was the programmer for the GXMOD tournament mod for Quake 2) and while the original Quake had network multiplayer, Quake 2 really nailed it to a degree Quake 1 didn't in terms of things like multiplayer map design and weapon balance (from a multiplayer perspective).

In any case, I respect Carmack's reply here not so much for the insight (which is also nice) but for the clear, direct empathetic apology at the end. He could have leaned on the fact that he was 24-25 when this all happened and that would have been a perfectly reasonable explanation, but the simple and direct apology is much more respectable.