Played Counter-Strike when I was younger but was garbage, used to run some Quake and Unreal as a kid too but I can't say I truly got into it competitively. I thoroughly enjoyed whooping ass on Rainbow Six Vegas 1 and 2 on 360, but I hated gamebattles(was banned at one point because I talk so much shyt in the feedback reports

) and thus I did my best to just avoid that altogether and run scrims with the pros instead.
Halo3 and onward were all pretty terrible IMO. The net code, bullet spread, bullet refunding, bullets failing to register while blood flies out of your opponent, and ridiculous host advantage were more than enough to stop me from ever wanting to play it seriously outside of the MLG playlist in Halo 3. Halo Reach's bloom was terribly executed and in general just wasn't fun to me at all, easily the worst Halo period. I actually enjoyed 4 but the small things fukked it up for me...(zoom sway on hit and such), and the community for it fell off massively compared to every other Halo game.
Other games include Ghost Recon Summit Strike(OG xbox piff) and Shadowrun for the 360...that game is too much puff man, so many nikkas overlooked that. For a console game, it presented the perfect mix of shooting skill, strategy, knowledge of the game, and teamwork to win. Console CoD, Wolfenstein: Enemy Territory on PC, and that new Counter-Strike Global. Wasn't pro or close to being the best at a lot of those games but I still played and followed enough competitively to know what looks good and what doesn't.