Originally Posted by Am*
As for what makes a game old school is pretty subjective
Um, not really, no. Old school pretty much implies that the game (or whatever) should be similar to older games of this genre and old fps games had a pretty damn specific gameplay: no npcs, maze-like levels, keys, weapon arsenal, medkits, kill-em-all style of gameplay. Doom, Heretic, Duke Nukem 3D, Shadow Warrior, Blood, all these games are old-school fps games.
An fps with health regeneration and without the ability to carry the whole weapon arsenal simply cannot be considered old school, because these two features were CRUCIAL to the gameplay of old school fps games. A modern first person shooter with arcade-ish gunplay is just that - a first person shooter with arcade-ish gunplay. Not an old school fps.