It exaggerates perks and differences in connection.
Say you fire off 7 rounds. Connection's a little squiffy, but 2 hit, the guy's down and dead. Doesn't matter who you shot or with what.
Now in softcore you fire off 7 rounds. Connection's a little squiffy, but 2 hit. The guy's still running. Unless you have stopping power and he's been hit recently, in which case he's down. Though if he has painkiller, he's still up. Oh and by the way, he's closed the distance and has just knifed you in the penis. G'night.
First softcore game I ever played, I shot a guy across the map at Highrise - windows one side to windows the other, so no more than 100yd - with a Barrett .50 cal in the head. And he kept going.
Silenced, FMJed EBR last night at Demolition I put three into the chest of a guy I play with a lot and he was still up long enough to knife me, and two into the head of a guy defusing the bomb before he died. Sureshot got 2 HBAR rounds into me once and I noobtubed him before any more reached me - 2 HBAR rounds should be death, and probably for anyone standing behind you too - and I was only packing SitRep, Danger Close and Scavenger.
I just can't stand how many rounds it takes to even stop someone in softcore - and I couldn't in COD4 either. Nearly snapped a controller clean in half in a private game through frustration with how feeble the guns are.