I played some single player Madden last night among many other games, just to test out gaming on the ST60. I am actually going to post a longer message on the ST60 input lag thread.
I do not believe that I felt any lag in Madden. The game felt the same as always. This does not mean that there is no lag. I just don't think that I felt it.
But to be fair, I am not a good Madden player so I played the lowest difficulty just to feel the game on the ST60. Heck, maybe the reason I suck at the game at higher difficulties is that my previous TV had bad input lag too! (Coming from an HP plasma, PL4260N).
Please don't read this message to be that input lag is a non-issue. All I am saying is that my experience was that in single player mode, Madden didn't feel noticeably different.
Still trying to figure out how I felt with FPS games in that they felt fine, but not great. But I can't say it felt worse than my previous gaming experiences with BF3 and FC3 (and Deus Ex with I downloaded from PS3+ just yesterday), because I am no longer a big gamer. Used to be though.
In Deux Ex (and it was the last game I played last night so the following experience may have been present in other FPS games), if I really focused on finding lag, I could perceive the very minute gap between moving the joystick and the character turning or moving. But seriously, I had to really focus on perceiving it.
Logically, there is going to be a delay between any joystick move and the corresponding move on screen. The key is for the delay to be so minuscule that it is not perceptible. I would say that the delay I perceived when focusing on it was imperceivable if I was not looking for it.
I am going to at some point connect my PS3 to another TV in my home to see if the input lag that I was able to focus/find is also present on the other TV.
As I said earlier, I had to focus on feeling the lag to actually feel it, so that's a good thing. Bear in mind that I am not a serious gamer anymore (years past in fact) and I was experimenting in single player.
More to follow in the input lag thread as I had a specific experience in MLB The Show that I'd like to ask the more scientific among us.
My general feeling thus far is that from a casual gaming standpoint, if you did not know that the ST60 had higher input lag, you may not even notice it. But what you do notice if you notice, by no means makes games less playable. At least the games I've played. Single player, of course.