Colossal amount of bullets? learn to aim... it only takes a couple of shots on normal mode to kill someone, spraying gets you nowhere... well actually it gets you on hardcore servers.
What is the point in playing a mode where someone spraying only has to wait for the law of averages to kick in (which isn't long since the guns in CoD4 hyper-accurate with next to no recoil) to get his kill? hardcore is completely aimed at destroying the skill divide that even normal struggles to keep. I have never seen an FPS game try as hard as CoD4 to give people with no reactions, awareness or aim so many free kills, its pretty ridiculous. My dad loves playing CoD4 on hardcore mode... he can't play counterstrike, because its way to f"ast paced" (his words) for him and he could play a dozen maps and never get a kill, he doesn't really like CoD4 normal, as even though he can get a few kills he gets pretty horrible KD ratios, but hardcore he seems to get 1:1 pretty consistently which from someone who spends most of their time looking at the keyboard trying to find where "strafe left" is pretty astounding.
You can spot hardcore candidates a mile away, just one of the many axioms of FPS games is the following: It doesn't matter where you are stood on the map, there will only ever be a handful of visible chokepoints where the enemy can come from, these are your only areas of interest at any given time, nothing else should have your attention... pretty simple yeah? I doubt many of the people posting here follow that and please feel free to go join any public server and bare witness to how many people do the exact opposite. Next time your team is pinned in a corner on a public, actually look around you to see what the rest of your team is doing, I assure you the vast majority will be hiding behind things not looking at anything at all useful. But hardcore works for that sort of player, the emphasis of awareness, reactions and aim are completely removed from the equation.
If your playing hardcore, using juggernaught, spamming m203s at any pixel that moves for fun... fair enough, fill your boots. It's the people that somewhere along the line convince themselves its the definition of skill to do such things that my elitism metre begins to twitch.