I wish I could join in the festivities of this input lag free online you speak of but unfortunately it's a hit or miss for me. I'm weird to my router and get a consistent 10-15mbps speeds and this game still has input delay out the ass. The problem is the most noticeable in king of the hill mode where it's the one person going 10 - 0 using Deathstroke and everyone else getting maybe one win because they can't get in on his spamming guns and grenades. Deathstroke's zoning has recovery frames leaving him open for attack but when online input lag is thrown in the mix his zoning becomes invincible against characters that can't teleport or fly past it. Now before everyone bites my head off thinking I'm crying about Deathstroke again it's not Deathstroke that is the problem it's the input lag in the net code that makes deathstroke a problem. The same could be said about plenty of other characters doomsday, Superman, Sinestro.
The online is better but far from perfect IMHO. My only real complaint is NRS needs to fix the lag before they start nerfing or buffing characters.