That's not correct at all. Through the year they have roughly the same large releases, the difference is that MS and Sony haven't been doing any of the smaller games.

That's fine if that game is more ur style, but that's not the point, I'm just pointing out that Nintendo is able to pump out a solid amount of games while for the most part retaining high quality. That is pretty hard to deny.

Edit: they also make games in many different genres with vastly different play styles.

Not really, theres Zelda and Xenoblade on Nintendo's side and Microsoft has Halo, Forza, Tomb Raider, Quantum Break.  I also think Scalebound could be late 2015 considering how fast Platinum has been pumping games out, they released Metal Gear Rising and Wonderful 101 both in 2013 and then Bayonetta and Legend of Korra in 2014.

Well they aren't doing it all by themselves, here are some 3rd party releases within the same time frame

Ace Combat: Assault Horizon+

Monster Hunter 4 Ultimate

Ironfall

Devil Survivor 2: Record Breaker

Etrain Mystery Dungeon

Story of Seasons

Lego Ninjago

Lego Jurassic World

Affordable Space Adventures

Citizens of Earth

Mightly No. 9

SpongeBob Hero Pants

Combined with the Nintendo published titles, that's averages out to about 1 game per week. Also take note that I'm also probably forgetting a bunch of other 3rd party titles.

And about the unified thing, Iwata has talked about it a bit. They have in the last 2 years merged their handheld and console hardware divisions along with unifying their software divisions. He said they plan to make their devices more like brothers that have similar architectures and power which will allow for increased software output by making cross-platform development easier and make it easier to port games to/from one another. It's currently unknown if all games will be playable on either device, although that is what I'm hoping for.

Most of those don't have widespread appeal but it's good that the 3ds is getting decent support.   

Devil's Third is also a pretty large title, so that's 3 vs 4 in Microsoft's favor, I'm not counting Scalebound as its not currently listed as 2015.

Nintendo in total will probably have something like 20-30 published titles this year, with a large range of production values, a few low budget, a few high budget and most mid budget.

That's one thing nobody can say, is that Nintendo doesn't support its systems. I wish others would take suit but I guess they feel they don't have to due to overwhelming 3rd party support. Anyway, congrats to the Big N.

I'm fairly confident we might get Yarn Yoshi possibly in April-May also. It's gotta be done, I'd be genuinely surprised if they let it slip into the summer, but we'll see.

I wouldn't count it cause it looks like a 360 game and not an impressive looking one.  But the developer did say its changed a lot since the last time we saw it so lets see it when they show it again.

Splatoon also fits that bill for me, but it's hard to compare games like this without any idea of the actual game length or amount of content as to the size of the game.