If any one of you guys have EVER played Starsiege Tribes, you guys would not be having this discussion. Tribes is THE hardest First person Shooter i have ever played. There are sooooo many things to support my claim, here's a few of them:
1. Enviorment-you're not in a small room, you're out in an endless field with lots of hills/obstructions, so splash damage only works if you shoot near the guy.
2. Real physics-when you move around they factor in your movement to your shot's trajectory. It doesnt work for fast shooting guns such as machine guns and lazers (since light and hig-velocity flacchettes are almost instant). But if you are shooting say a rocket facing the side of a transport while your moving foward, that rocket wont hit where you aim, but rather to the side of the direction you are moving. Your moving speed/force is facotered in.
3. Speed, No fps i have played have ever matched up to tribes. Everyone in tribes has a jet pack and you fly like hell. This really realy takes skill to hit a moving target that's ten times faster than running speed.
4. Realistic damage-there IS NO ARMOR in tribes, it takes only 1-2 shots to kill someone with stormhammer and 5 direct shots with a plasma weapon. You can't get armor patches. You can however choose a heavier armored player at the sacrifice of speed.
5. Gravity, Things actually speed up the longer you fall. You can use this to use a "sking" method of flying, falling off a cliff to gain speed then jet back at the last second to use that speed and turn into flying velocity.
6. Team play-you've got a team, and you;ve got to defend it by deploying turrents, mines, etc. There's also recon and info gathering with spy cameras, radar arrays, etc. There are also different classes of armor for defense, assault, recon, etc. You have to repair base installations, turrents, etc when they are destroyed. You can help artilary units aim at targets by deploying beacons, and using a targettting laser. Light armors fly transports in the air and to enemy bases while team members in heavy armor in gunery positions assault from the skies.
7. Thought- no more hardcore hull-bashing assualts, defended areas are REALLY defended, turrents and base installations have sheilding and you cant take them out without the help of a fellow player in a heavy artilary suit. You can also disable base functions if you can sneak into their base to destroy their power generators.
8. versatility, not just run and shoot anymore, there's run, jump, fall, fly, pilot starships, be a ship gunner, be a base turrent gunner, and your classic boxed-in game with in-base fights.
Tribes is the hardest fps i've everplayed, it takes so much skill and concentration to hit moving targets since a, they move sooo damn fast and b. they're usually very very far away. Tribes is real battlefield combat.