Single-player is just bot-match, but at least i tried out some of the worst maps, no wonder they are not very liked in the MP. This experience made me feel some special kind of special.
Gladly i played a lot of MP in my time and it is great, they removed all the dumb guns and returned great ones, though BFG10k in q3 is boring. And the levels are bright and colourful with a lot of jump-pads.
It was great playing DM in 2000, but when i returned to it in 2007 i discovered the joy of TDM and CTF. Then i stumbled upon "excessive" mods and they are just great, they amped all weapons and gave them infinite ammo while giving players armour and health, with quick regeneration. It removed the camping from the game and increased skill dependence in every fight. Besides, it's just awesome to play. Like in some versions shotgun shoots railgun slugs in spread or each BFG shot is surrounded by a lot of grenades etc.