IIRC Nintendo and Rare had some problems, thus the main the reason MS bought the company, but don't quote me on this. There's been numerous interviews with ex-Rare employees saying they regret going to MS and I believe some of the members are working on Retro's studio.
But to answer the question I do believe Rare would have step down a little in quality, but not as much as it has been with MS...
Nintendo and PC gamer








