Yeah I own SNES Doom myself and have sunk many hours into its 15fps glory, haha. Interestingly, it doesn't use the actual Doom engine, but a custom engine designed by the guys who ported it, which they called the "Reality engine". Some steep compromises were necessary to get it running, but funnily enough it actually has some advantages over versions on stronger hardware; for example, the level designs are closer to the PC version, and its the only console version from the 90s to feature the secret levels, plus it has the Spiderdemon and Cyberdemon bosses that were missing from the 32X, Jaguar, and 3DO versions.

It's certainly a curious case, and definitely an example of a port that was considered impossible by many at the time.

DOOM on the Switch is pretty damn impressive. I mean my potato PC with its R7 240 is still much more powerful than the Switch, yet it can barely maintain 30 FPS on its lowest settings at 720p. And considering the former is portable makes it even more impressive.

No, the R7 240 is NOT much more powerful than a Tegra X1:

Guess my PC really is a potato...

The 3DS version was obviously dedicated to the hardware so it ran really well. Its impressive that it can run at 60fps even with all the chaos and the Pokémon and assist trophies also looked good despite them running at 30fps. And it can run well online if both players have good connection.

Forza Horizon 2 is hugely gimped for Xbox 360, to the point where the first game actually looks better graphically.

-invisible borders everywhere, when they weren't present in xone version

-no dlc

-no cross country races

-only half the showcase events 

-no drivatars

-no weather

-airport, harbour, and castle areas are inaccessible.

I could keep going on and on.

Criterion games was always great at optimization. The same game had a Wii U version, which performed and looked better than x360/PS3 (something that can seldomly be said) because they took some extra time so the game can take advantage of Wii U's gpu.

Worth noting that the Google Pixel C GPU is clocked at ~850mhz, and the Shield TV at 1ghz, whilst the Switch GPU is clocked at 768mhz whilst docked.

So the Google Pixel C is close but still better than a Switch. But yeah an R7 240 is definitely not "much more powerful" than the Switch's GPU. It's very marginally better. So not surprising that Doom could run equal or better on the Switch.

I don't disagree about looking better as the wii u had improved textures in a few places but the game still had a cutdown number of online players, slower loading and lacked the 7.1 soundtrack of ps3 for example. Also the lack of analogue triggers on the gamepad meant the game simply didn't feel as good to play as the ps3 and 360 in my opinion, rumble felt worse too. I personally consider it a weaker version overall in actual playability (I own all three versions). For me I'd struggle to decide which is better ps3 or 360 and wouldn't consider the wii u to be in the running. It's not always about better graphics if the game is cut-down elsewhere.

All you say is true, but the that's more the fault of the wii U for having no analogue triggers, weaker gpu, and inferior online network.  That dioesnt take away from Criterion.