I'm in the same boat. I do like FPS games, but I RARELY go online. That's because I hate people like sMoKINbLUntZ420 or seXypLAyA69 (we all know these types of players) rage non stop, and blame everyone for everything. I might be inclined to try online gaming with friends, but ugh, listening to whining 14 year old kids who are on red bull adrenaline rushes past their bed time, no thanks. Back to the TV though. I wonder if input lag wasn't a measurement, would we still notice? We'd probably write it off as "oh well there's a slight reaction time.... but wow
look how gorgeous this display is!" They're on a 24 inch low ms monitor. We're in out living rooms on a couch, playing on possibly the best TV ever for your money. Is the lag that bad, does it hinder your gaming experience that much that it's a must return for an LCD? Do CoD, Halo, BF, kills really mean THAT much? Someone else in another thread brought up other variables. Personal reaction time, team coordination, familiarity with maps, skill, etc. Not every player is a pro. Combine that with your wife nagging you to fix the shower head now "because it's just a game, you can pause it", kids screaming for juice, the dog begging to go outside, phone calls, UPS at the door waiting for a signature, hell anything REAL life related if you're not an isolationist, will affect you.
Growing up we didn't have the internet. We had Game Pro and EGM magazines. If we wanted to rent a game, the first few parents to the video store won and got the newest release for the next 3 days. Almost the same with buying games. No video reviews, or in depth break downs. It was 3 paragraphs on page 49 with 3 small pictures and score with a little blurb. We didn't say ewww to an 8.7 with sometimes clunky AI, PASS! Maybe I'm just an old fart now. Gaming culture changed fast. It was a fun way to break up a boring night, not a second job. Just like plasma vs LCD. Every year average families go to Best Buy and wing their new TV selection on a Sunday afternoon. You know what? They're probably happy with their purchase too. Maybe they chose a plasma? Maybe their raving about how good it looks, and how good their gaming experience is. They're not thinking of boxing it back up because they get a frame or 2 of lag.
I'm sort of rambling here (this post isn't directed at anyone on the forums) but they're just my thoughts on the subject.