Personally I hate hardcore because gun balance gets completely screwed up. Weapons are balanced on TTK and lowering player health throws that out of wack. It removes the reliance on accuracy. If you can pull off headshots consecutively in Vanilla BF3, you are rewarded by a lower TTK. That's not the case in hardcore as headshots count the same as a bodyshot with any other high damage weapon. It's like this in both COD and BF.