The game sucks.
If it wasn't for the outdated graphics,unreasonable frame drops,game crashes and bugs and glitches,it is for the gameplay.
The gameplay of this game is designed bad and shows how badly someone can add features in a game without taking consideration of how they will work out.
1) Duke Nukem Forever's levels where designed many years ago,and after lots of time they decided to add health regeneration to the game,and this feature forces a "cover and shoot" tactic.
But developers didn't bothered to edit the levels by adding cover spots,forcing you to play a game that requires cover tactic in levels that doesn't have enough places to cover because they where designed at a time the game didn't had health regeneration.
So there are many times that you have to fight multiple powerful enemies without cover,and you can't just ignore them and move on,and you feel overwhelmed.
You loose many lives because of this matter and you feel like the game is cheating on you and punishes you without justice.
2) The weapon limit feature was also added later and without much consideration.
There are times you will complete a level having the 2 weapons most ideal for the level you where playing,and when the next level load you will discover that your weapons aren't that effective against the enemies you meet on the new level,and there will not be ideal weapons lying on the floor on that new level,and you will have to restart the level you already completed so you go to the level exit having the guns ideal for the next level with you.
It sucks when this happens.