From what Ive been told, and know from experience, LCD's are actually bad for gaming due to there response time being slow (This is from what I hear) And if your playing FPS thats what its all about, It could mean the difference of your aiming hitting and not hitting.
I use a Laptop atm while I wait for my comp, (been using it for 1 year) As soon as I switched to a CRT (WCG canada) my LG (Lightning Gun in Ut2003) Went from 32% to 44%. I dont know if it was luck, but the shots didnt seem fluked. I heard there are quick response LCD's but I still have to do a bit of research on those, my guess is there expensive.