Pistol

Hits much harder than normal doom's pistol and is perfectly accurate. Great for long range engagements.

Shotgun

Much stronger and has a tight spread. Good for distance combat and in conjunction with faster firing guns.

Chaingun

Mild spin-up time before firing. Hits more often and harder some of the time, good choice for up close and mid-range weapon.

Rocket Launcher

Everybody's favorite spam-cannon just got faster! Rockets travel 10% faster.

Plasma Rifle

Now fills the "area denial" role with a very high fire rate but the same damage per second.

Fist and Chainsaw

Beefed up to very quickly destroy enemies. 2-3 punches, very brief chainsaw contact.

Overall

All weapons, except the BFG9000 and Plasma Rifle now switch almost instantly for more fluid and varied fights.