No, I'm interested in what you personally consider to be a "great" game, when you talk about great modern games like you did.
Dishonored and Prey, yeah. But, what is Prey exactly? I think it vastly builds up on System Shock's ideas. And Dishonored does the same with Thief and Deus Ex.
Of course, you have a point about the rarity of genre defining games, fair enough. They are rare by definition. BUT, there's just so much copycat sh** these days, just made to bring in the hundreds of millions of € development and marketing money, playing as safe as possible, for a professional industry which kills creativity. That's the sad truth.
Not to mention the way games have evolved over the years, into cinematic "let the player do as little as possible because he rather likes to watch a movie than do stuff for himself". I absolutely detest that development. I recently played through Gothic 1 and 2, and, it was quite an eye opener, TBH. No quest markers, riddles, no 10 minute cinematics inbetween, no magical focus view to know which items in the game world you can interact with, no item highlighting, no nonstop babbling companions... just good how it used to be.
It's interesting, by the way: I always thought this mod was a reaction on the way Thief developed since Thief 3. For about the same reasons I just mentioned: Dumbed down gameplay mechanics. Personally, I don't find Thief 3 half bad, I recently played it through, and it was loads of fun again. But, Thief 4 was very badly received, because it not only implemented a lot of the modern aspects of games these days that I described, but, also because it pretty much failed in converying the vibe, atmosphere and characters of the original games. Thus I'm always surprised again that modern games are held in such high regards by you guys. I think most of them are absolutely bloody awful.
I agree though that Dishonored, Prey, SOMA (in parts... I absolutely hated the babbling NPC's), Fallout New Vegas, or Dead Space are nice games. Are they great games, or genre defining games? Hm... I don't think so. Fallout 3 came out before New Vegas, and, if anything, you could call that genre defining. Amnesia came before SOMA, so did Penumbra before that. I think the industry had its pinnacle in the late 90's to early 2000's. If you take Deus Ex for example, it screams "Let the game designers roam free" at you from every pore. At least that's how I perceive it.