Meh. I was going for all golds for awhile, but I only made it as far as the gold AK47 before giving up. Even under hardcore mode where more headshots are lethal it was really quite difficult to get consistent headshots with some of the SMGs (the Uzi, mainly, but the P90 is hardly any better on the recoil side of things).
As for the ratios and whatnot, all I'm saying is hardcore removes the need for most of the game's content and waters it down to one thing -- the ease at which you can control a gun's recoil has the ultimate say for how good it is. Power is altogether obsolete since every gun can one-shot within its proper range and no gun does more than a two-shot (without Jugger/walls). D:
Whereas something like the AK47 has its place in normal mode because it's the only automatic rifle that does that kind of damage (same as G3 and M16), in hardcore mode its power is of no use to you. Therefore, it's strong recoil does nothing but hurt you unnecessarily. This applies to
most of the guns, actually, including the shotguns, LMGs, snipers, and the semi-auto rifles.
I've even found that the SMGs are mostly pointless too because being able to kill with one bullet eliminates the advantage they have in being more accurate in close quarters due to their tighter spread. Thus, the only two guns that truly stick out as good are the M4 and Skorpion.