Urgh. I feel like I'm demonised when I go bashing on Duke, but seriously was it really that good? Good enough to merit people bothering to create HD packs and hacked engine upgrades, etcetera? I really don't think it was.
If we're talking 2.5D shooters it ranks about average in my book, the only real thing it had going for it was the absurdity and the puerile macho attitude thing. There are others way more deserving of such attention, Blood, anyone?