As a PS man..

Nintendo - backwards compatibility. I wish PS4 had launched with PS1+PS2+PSP emulation. Couple that with the PSNow rollout and you'd have almost the entire PS library (minus PS3 games unavailable on PS now and the vita library) available on this console, crazy good missed opportunity. Just PS1+PS2+PSP alone would have been a godsend. I still hope this happens.

Microsoft - can't really think of something. Maybe "letting" Insomniac and Swery do their new games, but I wasn't very pleased with the result so it's 50/50.

I'm obviously a Playstation dude:

Nintendo:

What I Appreciate:They have by far the best first parties this generation.

Explanation: I played a ton of MK8 and Super Smash Bros. ( at a friends house ) and I've also played a lttle bit of Splatoon. It's honestly the first console ever that while I don't have a huge list of games which I want to buy/play on the console, I still want to own it ( Currently looking into that ) .

Microsoft:

What I Appreciate:They've turned things round alot.

Explanation: Phil Spencer is probably one of the best things to happean to the gaming industry as a whole. He ( and the rest of the Xbox team ) have turned a product which was utterly repulsive ( In terms of "DRM", always watching and all that Jazz ) into something I would personally be very proud of owning. Also they have a great selection of first party titles, which in certain genres beats the first party games found on Sony's console by miles.

Sony - Good line up of exclusives and third party titles.

Microsoft - Fixed a lot of mistakes they made ever since the XB1 made its debut.

Nintendo: Has shown that no matter how good or bad the sales are, it is still important to release high-quality 1st party games. They are first class this Gen.
Sony: Has shown that the best console spec-wise, also is affordable and relates to the masses. And it has awarded them a market leading position, well deserved.

Nintendo Guy:
As far as hardware goes, Sony did *literally* everything right, and I think PS4's OS and UI are fantastic as well.
Really great machine.

Microsoft: They learned their lesson.

I don't particularly dislike any of the companies, but since Nintendo is my favorite, I'll take Microsoft and Sony as my non-favorites.

Sony - understanding what players want. Everything about the console and library is built on this understanding. They even have a slogan in some ads now that says "this is for the players"

Microsoft - opening up windows 10 for developers. You may not know this, but the major tool for writing code for Microsoft platforms (Visual Studio) is now compatible with all the most popular non-MS languages. This means that a dev that has no knowledge of C# (most commonly used MS language), but has made iOS or Android apps before does NOT have to learn C#. He can port his game to Windows 10 in the language he already knows, and seeing as windows 10 is now one unified platform, the same code base can be published to XBox, PC, Windows Holographic (Hololens and future 3rd party hardware that will run the same OS) and Windows Mobile platforms.
But as for what they've already done since the launch of this gen, nothing impressive

To be honest nothing really, there are only few exclusives from nintendo not made by nintendo who i am jelous and maybe scalebound from xbox if it turns out to be good.

But as far as design and specs of the console itself goes the ps4 has everything right. Yes i know the wiiu is backwards compatible but its only true if you own a wiimote and they could also put backwards compatibily for gamecube games as the wiiu has the same architecture.

As a Ninten guy...

From the PS4: Their JRPGs

From Xbox: Sunset Overdrive

Nintendo: Supporting there failing console with a fantastic first party lineup.

Microsoft: Phil Spencer.

Microsoft: they dropped X1 price and removed Kinect which helped the sales.