Personally I feel these games represent a lack of imagination and risk. Clone the trope. Probably more risk than imagination. Game development costs money and is an investment. People investing their money don't want too much risk. Point to a successful formula that resembles you're idea and they might invest. If you don't have a precedent to comfort your investors then you better hope you can raise that money on your own.
The buying public isn't much better either. I'll only buy things which are familiar until the weight of critical and public opinion that something new is worth seeing reaches critical mass. Take Breaking Bad for example, barely anyone watched, it's only because it was on a 'cable' channel and relatively cheap to make that they managed to survive long enough for word of mouth to catch on. Now just watch as we see 50 new shows in the next few years trying to mimic the formula.
Which is why we have brilliant cult classics that forge a new genre, usually made on a shoe-string budget. Then about a thousand clones of that.
Examples of things that broke the mould (in the public's mind, most had predecessors that were "before their time"), then think about all the things that have 'cloned' the trope since;
Star Wars - Sci Fi had been largely psychological thriller, action adventure. Sci Fi fantasy exploded after this.
Ico - Although it had been done before this clever original game became the template of the rash of SCSW games Yahtzee is talking about
Lord of the Rings (both books and films) - Medieval fantasy wasn't much of thing in books until Tolkein first succeeded. The fantasy film genre has been hit and miss (mostly cult favourites by fans of books) until Peter Jackson's films.
Harry Potter - Try to think of a successful a triple-AAA blockbust movie based "magic" prior to Harry Potter that doesn't involve Xmas
Twilight - Teen drama with fantasy twist. See True Blood
Hunger Games - teenager survival genre
3 issues that bug me about all of this;
A - Stop with the "end of innocence"/"Coming of age" shit. I feel that 90% of "arsty" foreign films that get awards are basically SCSW. In my experience that all have 3 elements 1. An animal must die. To show that the world is "real" and mortality touches all 2. A naked person, but not glamourous - sexual awakening arty people basically using "sex" as some kind of artistic statement. 3. Old person giving advice.
B - Stop with the fucking Orcs and Elves already? - It's called fantasy, FANTASY!? So what do we get? The exact same archetypes, tropes, universes. I loved Abe's Odyssey mostly because it was actually different!? 50 years on we still have dwarves, elves and orcs (or slight variations). Mass Effect branched out but if you look closely you realise they still leaned heavily on those types still.
C - The reason films like Star Wars, The Godfather, Pulp Fiction, even Rocky... have done well, is because they were DIFFERENT! Youngsters may watch these films and think they're a bit shit and wonder why people thought they were great. That's because you've seen clones, clones that changed, and possibly improved the genre, and usually had 10 times the budget of the original. But people have fond memories of those originals because they were NEW. Hollywood still really seems to misunderstand the concept of Novelty and New.
TL

R- If I can make a drinking game out of your game/movie/book, then you've made a clone. Take some risks