I used to play quite a few shooters, multi player...but that was years ago. Along about the time Half Life 2 came out, they started making me motion sick. The only thing I play multi player now, on the pc, is mmo's.
The mmo I probably put the most time in, ever, was eq1. But, that was also a long long time ago. Probably 2nd most would be World of Warcraft. For the past few years, however, I only play at expansion launch, and then it's just till I hit max level, and see most of the content, then I close the account again. I probably wont be back to the game for the next expansion, unless i get reaaaaaaaaaaaaalllllly bored. Really tired of it.
Also, I play ffxiv off and on. currently off.
I keep Aion installed, since it's free to play. Every once in awhile I'll log back on and play for a week or two, before putting it away. I can do that with ftp games, and not feel guilty.
Currently, the only online game I have is Blade and Souls. Been playing since the first Alpha. Still in beta, launch isn't till next month. This is another beta weekend, so I get to play later on today.
Other than that....nothing. I've thought about trying out some modern shooters, but honestly, I'd probably get real tired of other people if I did. I avoid them now, to keep my sanity, and anything resembling good will towards my fellow man