I probably played through Quake a couple of times when it came out, as I had too much time and not enough £££/games back then, but it never grabbed me in the way Doom did. I was also too young to be allowed internets back then so online multiplayer passed me by entirely. :(
What it did have, and was perhaps its greatest pioneering achievement, was extremely powerful and flexible mod support. That Quake survived on my hard drive past a fortnight or so of time was primarily thanks to the mod compilations that regularly got put out on the cover discs of the gaming mags of the time. Reaperbots were the most important fixture for obvious reasons, but they sometimes precluded other mods unless they had support for them.
I remember spending a lot of time playing multiplayer maps with a mix of Reaperbots and some other mod that added a bunch of new weapons and behaviours that was way, way, ahead of its time (it might’ve been a compilation pack?). I recall it having remote steerable rockets (like the redeemer in Unreal), nail grenades and even a portal gun. Of course the bots didn’t know how to take advantage of those crazy things but it was still a lot of fun turning them to paste with them.