if you think of any new shooter that you can make, you'll find it's been done already or very similar, what is there left !
you can only make a variation on an existing game, just like designing a new car, it's only age related because you've played so many, but very similar sequels dont help at all...... because Borderlands 2 is still on Pandora/ claptrap/ Marcus/same vault hunters..... Jesus Bloody Christ, it would be so easy to locate it on one of the 6 other planets, this would change it totally
Crysis 3 :- still in NY, same Nano suit, enough said....Bioshock 3 looks the same, fallout 4, FAR CRY 3.....all of these could've been different.
so no, it's deffo the developers faults, it's done to save money, plus the same guys are still working there and they're huge fans of the original game, so it goes ``lets make a new game, similar to the 1st but with some improvements to this that and the other``, they then mention it on the forum but all the die-hard fans want a return to the 1st game, ``make it like the 1st FAR CRY, that was a brilliant game``.........so there you go
what about DOOM 4 ? Well it has to be a single player only, just like all other horror shooters and it has to be located either on a planet in space, or back on Earth, so by default this will make it like Hellgate London/ Gears of War/Doom 1 and 2/ Resident Evil/ Serious Sam, this similarity cant be helped.
it'll be a guy with a big gun shooting zombies and Demons that jump out from every corner, it'll be very dark and look just like Stalingrad circa 1944...because it does already in the photos !