To me, this is another case where Microsoft and Rare should've just made a completely different game--the other being Nuts & Bolts. It plays and kinda looks like a Killer Instinct game, but something is missing. Most of the original Rare team left some time ago, prior to Nuts & Bolts actually.
That seems to be the sentiment on Nintendo ditching Rare and Nintendo not getting those titles. Especially Banjo-Kazooie and Conkers. While Conkers is on the mature side, both series would fit in more along with Nintendo's stable of characters and series.