no, i've just noticed it on every game i've played. It breaks geometry wars and just about any online competitive game as the input lag puts one at a disadvantage versus those on the 360 who aren't overcoming the same issues. Markman recently confirmed that TTT2, which leaked like some other games did, also had noticeable input lag
If you want to play UMVC3 online, you don't want input lag. Hell, you shouldn't want input lag period but there are games where it isn't quite as impactful. I managed to overcome it to finish the campaign of Super Meat Boy but it was there, too
if they dont iron it out to make it damn near imperceptible, you see people shit all over it as soon as a COD game comes out.