I game fine on mine, and its a fantastic picture. I do play Bf4 online and would say that there isnt "noticeable" lag. Sure I probably have more lag than the folks who have PC monitors or TVs who dont have the same lag this one does, but I also enjoy a lot of other types of games and Im not so hardcore (anymore) that I get hung up being super competitive on multiplayer. Forza, AC4 looked fantastic on this TV.
By "noticible" I mean if I stand in front of a wall and shoot at it, when I pull the trigger there is no noticible lag. When I do something on my controller, it happens on my TV.
I die a lot, but that could be lots of things, the people Im playing, do they have mod controllers, do they play all the time, are the playing as a team better.
The most important thing to do for BF4 is turn internet smoothing off.
With all that being said, I have fun.
Do you have to change anything to go a good image? I keep reading about "screen fit". what exactly is that?