If you want to play some online (not in Quake Live), better gather some friends.
Most of the servers are full of players with 10+ years experience, and regular players have no chance against them.
You can even play with a skin of John Carmack!.There are characters from previous id Software games, such as Doomguy, Ranger and Bitterman.They can even respond to messages like chatbots (try typing "lol" or "John Carmack sucks" to them). The bots are charismatic characters with lots of funny lines.The game focuses more on multiplayer action, unlike previous games in the series, yet despite this it has a single player campaign that's basically a fight against bots.