Still, you can't "crush" games with 900$, that budget will cover only a GPU and CPU for me here in Sweden. You don't need 2000$ to play modern games but you need that or more to pull them off at absolute max at higher resolutions, which is what I'm choosing to consider as "crushing" a game.

Yeah, it actually helps me a lot on my laptop when I try to run fairly demanding games  

lol the $2000 dollar argument is for people who go around talking about 4k, triple monitors and ultra settings.

If you are talking about 1080p and medium settings, I dont think console gamers really care that you spent extra (compared to a console) for a higher frame rate on a game that released this late on PC.

I really hope every PC gamer who spent more money on their build than a console gets better performance throughout the gen, but if you didnt spend a lot extra, expect it to fall behind on performance on the newer games. Most devs are not going to optimise their games for old configuration, and even if they do, it wont be a thorough as with consoles.

PC parts reach peak performance and optimisation near launch and then become cheaper. Consoles become cheaper as they reach their peak performance and optimisation continually improves.

B-but, you need to update your PC twice every week to keep up!
In all seriousness, In all my life I just upgrade my PC every 6 years, it's always worked for me, lol.

Does it play Nintendo games yet?

If I spend 2000$ on a rig, it won't have a chance in hell of running 4k on ultra, let alone with more than one display connected, if I want my games to run, that is. That would require much more power, you will need massive amounts of video RAM, among other things, some tests with Crysis 3 at 4k resolution with a Radeon 295X2 yielded only about 20 FPS on very high (which isn't the max), a card like that and a 4k display alone would set me back more than 2000$ and it still doesn't offer terrific performance across the board.

4K is beastly, if you want to max that, you'll need at least 4-5000$ worth of gaming rig, especially here where the hardware prices are much higher, and doubly so if I'm running more than one display on top.

While $900 isn't enough for maxing certain games at 1440p/1600p, you can spend a few hundred more and do pretty well at said resolution. Here's a build I just threw together with U.S prices. Also, i think it isn't a good idea to use different countries for a price comparison. Consoles can go over $1000/1500 in certain countries, while PC parts prices remain relatively cheap in said countries. Brazil is a prime example of this. 

An $1185 build (before OS key and Keyboard + Mouse and after $90 rebates.)

http://pcpartpicker.com/p/yknDNG

Much closer to $900 in the U.S than $2000 and it should pass your Metro Redux test. 

It plays everything Nintendo excluding Wii U. I played Xenoblade Chronicles through the Dolphin emulator with enhanced graphics and framerate.

And the 3DS emulator is in its early stages, so 3DS games as well. 

Ok I probably shouldn't of used the word "crushed" but definitely playable on maxed settings and your right it depends on the countries cost. But here's a build that's $830 after rebates (still under $900) that'll play anything today.