Quake II did what no one expected, it surpassed everyone's expectations, and became more popular then the original ever was. Mods and maps flew out of every corner on earth, and quickly added countless hours of gameplay for anyone that had an internet connection. Quake II also boosted online gaming to another level, people were playing online more than ever.
I remember getting my copy the day it came out. I played it all day, and all night. I fell asleep at 7am, and woke up an hour later and kept playing. I was addicted from day one. I lost more sleep then I ever had in my life, and I had great pleasure blowing people up with rocket launchers when I should have been studying.