As if that was ever going to happen. 

Probably Nintendo. 

Ohh so, if you're counting all games "owned" by Sony, why not do the same with Nintendo? Where is:
-Pokemon Rumble U
-Game & Wario
-Wii Party U
-Sonic & Mario at the Soczi 2014 Winter Olympics

And I'm sure I'm missing some others. At least do some research before your Sony hate threads.

Go up about 3 or four posts and you will see.  

But to sum it up i suppose you want me to include Wonderbook and Eyepet adventures too right?

Not a hate thread either.

Jaywood, would you should do when asking a question like this, is to add a few more equations - and not simply go by the average score of games. You should at least have the sales as well to give a bigger picture of things. Scores isn't the end all be all, and I think sales gives a little better and broader view of what's going on and how well a game is received.

And to take this a bit further you could lump all game scores from Sony together and take THAT average and compare it to the average score of Nintendo games - and then do the same thing with sales.

Here's what I could dig up, make of it what you want:

2011:

1) MSFT! Average score: 77.2

2) Nintendo: Av. Sc: 74.4

3) Sony: Av. Sc: 72.8

2012:

1) EA! Av Sc: 75.2

2) MSFT: Av Sc: 73

3) Sony: Av Sc: 72.3

4) Nintendo: Av Sc: 71.2

So there you go folks, MS bested BOTH Sony and Nintendo for 2011 AND 2012. I have been unsuccessful to find how much SW Sony and/or Nintendo has sold in 2012 and/or 2013

It's funny to just look at the average review score of all the first party games (or exclusives) without knowing how many there actually were. For example, I'm sure there weren't too many Microsoft first party games (or exclusives) released in 2012, when Sony and Nintendo probably had plenty more.

Wrong way to do this. You need to take into consideration the quantity as well. No point in having only 1 game rated at 77.

This list is missing so many games....NSMBU, Lego City Undercover, Crashmo, Game & Wario, Professor Layton X Phoenix Wright, Tomodachi Collection, Pokemon Mystery Dungeon, DKCR, Taiko no Tatsujin , Scribblenauts, Wonderful 101 etc. etc. etc. etc. etc.

Anyway, I dont see why we need Sony games to be compared with this. Actually, I think Sony had an incredible line-up of exclusives in the last two years. It´s just that those games do not sell as well as Nintendo exclusive games, but their quality can´t be denied.

*Rolls eyes*

How is this  any different for Nintendo? Or even MS?