As much as I love FPS(pretty much the only genre of gaming I normally play anymore, minus the RPG every now and then), Dio is pretty much right. But to avoid trolling I'm going to steer this conversation to a different view, so bear with me for now.
To say that FPS hasn't evolved to what they are now, is in fact true. Let's go back to Doom for a second, you ran around and killed Demons. Then Manhunt, you ran around and killed humans. Basically the same thing right? Well there is different versions of FPS. I know :O It's shocking. Let's take a look at the often overpassed hunting games. Cabela's Big hunt is a good one. That one is in First Person as well. Then let's take a look at Call of Duty 4. Obviously different right? Well you see, Call of Duty and Cabela's are basically the same thing. :O
I know, I know. You may argue that it isn't. But the thing is, it really is. You see, they both have the same strategy. Let's look at CoD4 online to Cabela's. In Cabela's you want to get the biggest game, in CoD4 you want those headshots. Now that's basically the same. Now what if we took a twist on something. Let's add Manhunt and Doom into this category we have here. So far we have Cabela's, CoD4, Doom and Manhunt. They all have a basic principle right. Well let's compare them to an RPG. Mario Bros. We could also say they have the basic principle except that Mario Bros. isn't First Person. :O
Well all games have this basic principle, get the buyer to buy it. It isn't about whether we like to play the game, it's about how much money they get. Now if we like it, we make reviews about it and recommend it to other people, like I did here. Now about the whole Evolution thing... (A free cookie if you read this and can tell me what i've been talking about and understand it. Cause I sure as hell don't...)