The fact is nothing from Halo is creative. Everything from Halo is just a god damn generic gun that takes like one shot to the head to kill, because apparently nerf darts even work that way too. If we ported Halo weapons/vehicles to Blockland, not only would we get twice the master chiefs and ten times as many stuffty halo servers, we would get unbalanced weapons in deathmatches. I can practically relate ALL Halo weapons to IRL weapons, not to some super cool sci-fi weapon.
TF2's weapons are balanced. Headshots don't do much except if it's a sniper. They are actual real weapons, and the fact that you can carry more than two is great.