HALO is one FPS that really did introduce many new gameplay elements. It offers all that is said below and the modifications already in development look to refine and improve the "HALO experience" even more!
Reus FireFight Cryobay plus the brute and elite versions in HCEA Anniversary style. Type in console map_name firefight-cryobay-final - for brute version - firefight-cryobay-final-brute