the craziest thing about them was the amount of different genres they made and were still able to be really good at them,
the only actual studio that can do that is The Behemoth, but they need much longer for their games

Level 5

White Knight Chronicles series

Ni no Kuni: Wrath of the White Witch

Professor Layton series

Inazuma Eleven series

Atamania series

Little Battlers Experience series

Yo-Kai Watch series

Liberation Maiden

Aero Porter

Crimson Shroud

Weapon Shop de Omasse

Time Travelers 

Fantasy Life 

Attack of the Friday Monsters!

Bugs vs. Tanks

The Starship Damrey

Wonder Flick

IMHO i think a part of it is that Rare was afforded much more freedom in those days. Moreso than Retro is and no they are not the new Rare not even close

Intelligent Systems

Fire Emblem series.

Super Metroid

Paper Mario series.

Advance Wars series

Cubivore

WarioWare series

Pushmo/Crashmo series

Code Name: S.T.E.A.M.

If you are ok with N64 level graphics, then developers could pump out games at the rate that Rare did.  If you expect more, then it is going to take a lot more time.  Simple as that.

1. Is there any evidence at all for this?  Nintendo didn't support Rare's Conker's Bad Fur Day back on the N64 for just one example.  What change are you talking about?  Nintendo has always been careful about releasing only quality (and mostly family friendly) software under their name.

2. So people were just sitting around Retro doing nothing?  They didn't have more resources to allocate.  Games take a lot longer to make now due to the vastly increased complexity.  I'm not sure why the OP, and some people in the thread refuse to acknowledge this.

They could have kept the franchise IPs instead of sold them off. Then we wouldn't have were are the games comments on here as some other studio would have been able to do perfect dar, Jet Force Gemini, Banjo, KIller Instinct. 

1. Yeah, Conker's Bad Gur Day was released on the N64, they also release Geist and Eternal Darkness on the GC. As I said the contraction seemed to occur about a quarter or about half way through the Wii's life cycle. They obviously still released quality games and took chances, but you can name a number of games they decided not to release sequels to on the Wii despite the system and its motion controls fitting the game play like 1080 Snowboarding, Star Fox or F-Zero. Then you have some less then family friendly games that could have helped parched the drought in the Wii's Western (or NA in particular) release schedule between their own major releases such as Diaster: Day of Crisis, Zangeki no Reginleiv, Fatal Frame/Zero 4 and the remake of Fatal Frame/Zero 2 and nearly the three extremely well done Operation Rainfall games. These were small releases that could have helped during the back half of the Wii's life cycle, heck not cutting of the creation of games like Metriod Prime Trilogy, Fire Emblem: Radiant Dawn, Punch-Out and a number of other games less then 18 after their release would have also helped in that regard.

2. I agree with you but the fact is Nintendo controls Retro and how much they have to work with. Nintendo was more content for most of the Wii's life cycle to have Retro work on either Donkey Kong Country or working to help other teams (such as their contributions toward Mario Kart 7 stages) then actually working on new software. Retro isn't a massive team but they should still be large enough that you can have some of them working on one big project and others working on something smaller even if it is only meant to be a eShop or DS/3DS title. If other Nintendo teams like Intelligent systems and even Monolith Soft can work on multiple projects Retro should have output then they do unless they are being muzzled on what they actually are able to do. We get several open sandbox games and their sequels in the last generation, while AAA development is hard and a much longer process, just putting out software can still be done in reasonable time if effort and the main company is willing.

I've honestly been wondering the same thing. Retro is "supposed" to be the new Rare, but really just in that they work with Donkey Kong IPs. They don't release anywhere near as many titles as Rare did, and I really am amazed at the consistently high quality that Rare turned out, when they had such a rapid development cycle.

No other developer has ever had that, including Rare themselves, since then.

Well, you could. IF Nintendo started Wii U game devolepment of titles in the 4th year of Wii. But that requires them to finalize system specs really far in advance. And leave certain hardware revisions  as the years progress.