For a fair fight, the machines must run doom at similar speeds. Because of the plentiful supply of ammo and health, a good player can expect to keep going for much longer, rather than being fragged as a result of having no more ammo left. Hence altdeath tends to amplify the difference in abilities between players. The 30 second wait for freshly collected weapons will tend to balance the game out, forcing players to go for other weapons rather than buzzing around their favourite. There isn't one.
Every level has different qualities which influence weapon choice.
A. Well, the first point here is that we reckon monsters are just a plain old nuisance in deathmatch. All they do is piss everybody off and stop the game from developing quite as fast as it might. So there is no point going for UV or Nightmare mode just for the increase in the number of monsters. Whether you do this depends on whether you prefer to have the game dominated by the more powerful weapons or not. Doom's Problem Page Dr Doom tackles a heavyweight technical question that has been vexing many Doom players across the world.