My first competitive shooter experiences were LAN Doom 1 and 2 and then I really really got into a lot of Quake over TCP/IP (Hated QuakeWorld later on, floaty...) - and the original Counter-Strike was huge for me... I played a little bit of Unreal Tournament at times, didn't like Quake 3 I hate those flashy, overly fast, game-show feeling "MONSTER KILL" crap games. This really goes for UT and Q3... I didn't have much interest in either one.
I've always loved shooters but I seem to have lost my taste for playing them online... I think this may be a blessing. I still have fired up Counter-Strike: Source and Global Offensive in recent years/months but I play them sort of minimally, and I'm okay with dying a lot.
I just don't have that drive to be the best of the best, or uber-leet and I just don't give a crap and I never have. I'm glad about this. I'm not a very competitive person so I can play StarCraft 2 online and if I get destroyed it's okay... if I win occasionally, I'm happy. Especially if I can do something odd to win.
I've been able to have some really good times in CS in all it's incarnations, and really dominate servers for periods of time... be top of my team... but it's very inconsistent. Sometimes I'm doing great, other times awful.
Never played the COD games really except when I was pressured into trying MW3 by some guys I knew, I only played it for like 1 or 2 days. Didn't really grab me.
All I can say is, those of you who are obsessed with online shooters and being as good as you can get at them... well, I sympathize. I'm just glad I'm not driven in that way. Single player will always be where it's at more for me, I think.
WhoBeDaPlaya is that avatar from Under a Killing Moon?