Hah, maybe it's just me, I didn't notice any real difference between the input lag in the beta and retail, but then I'm only a very casual gamer.
So anyway, last night I dragged the PS down and set up beside the desktop PC so I could use the Battlelog server browser on the website.
Have to say it's much better than in game - you can actually see a numerical value for your ping, just find a low one, join the server and set your network smoothing factor equal-ish to the ping and you're set. Worked a treat for me anyway.
Pain in the ass having to use a pc/tablet to play a ps3 game, but worth it I think.