Nah, good points both Gypsy and Spiney made. To me its an interesting debate , to a point I guess. IMO, it does trace back to the grandaddy of all 3d fps games, which from as far back as Wolf3d, probably onward, all have some familiar elements that were passed on.
Like I have said in the SOPPA posts here on the site, you can play this both ways...its positive publicity from an ID standpoint, because the experienced people are the ones who can recognize the detail involved, and those are the ones who will support ID products and be loyal. The ones who dont see it, will maybe buy the game, but miss out on the rewards that come from recognizing the original talents involved. Talent(s) , with an (s) that is. All this stuff about they ' stole my code ' goes wayy back:
Theres another part in posv where Bill Gates says hes is accused of stealing from the pirates....IE: who stole it first?
Go even farther back check out the Nikola Tesla story:
If he decided to copyright generation of AC electricity, would we be even arguing over who stole whos code online?