>The weapons and enemies seem boring
Depends on how you look at it. How much did you play?
Just your basic FPS starter weapon, it's not a whole lot, but you can carry a decent amount of magazines and it shoots fast, so it's a pretty decent fallback weapon. It doesn't share it's ammo with the Ripper, so it's not like in Doom where the pistol is useless once you have the Chaingun
Basic FPS shotgun, though unlike later shooters, it actually has a relatively realistic spread, you can hit an octabrain from across the yard with most pellets most of the time.
Basic vidya machinegun, has three barrels and looks baller when you're blazing away with it
Satisfying and efficient, you can blow up scenery and certain walls with it just as you can enemies.
Remote detonated explosive, can be incredibly useful
So this all looks relatively standard, but then:
One ray from this thing will shrink most enemies down into tiny size, whereupon Duke will step on them when he gets in range (on the flipside, if you yourself somehow gets shrunk, enemies can step on you, so never stop running when that happens)
Opposite of the Shrinker, only appears in Ep4, you hit an enemy with enough rays from one of these, then they'll swell up and explode violently, ammo is uncommon and it's not always the easiest to use, but it's satisfying as hell and when you do succeed it's a spectacle
Exactly what it sounds like, you can freeze enemies solid with this weapon, whereupon you can shatter them by kicking them, or shattering them any other way (bullets, bombs, crushers, etc)
Dual-Wielded rapid-fire rocket launcher (probably some kind of anti-air weapon), can absolutely saturate an area with volleys of mini rockets.
Just like in Half-Life.