Maybe not as bad as the obvious well known mistake in the industry that have been mentioned here, because a large number of games were very successful in that at that time, but there was a period in the last generation where the most successful genre was military shooters after the first large success of modern warfare, and everyone wanted to make a shooty shooty bang bang game with explosions just like Modern Warfare, even existing horror franchises like Resident Evil and Deadspace.
Like I've said, it wasn't that bad, but developers should have realized sooner rather than later that Call of Duty has its own market and audience, and should have sought after a different market or even the one they already had. So for a few years we were left with a bunch of games that looked boring and very similar to each other.
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