1st point is debatable, but it boils down to opinions, opinions, opinions (Banjo was awesome).
I don't know... maybe it' just me, but when I was replaying Banjo-Tooie, I became kind of annoyed at how much they recycled mission objectives per level. The shooting games where red ones are worth x points, green ones are worth y points and blue ones were worth z points are especially guilty of this. It's not as irritating and stupid as the level it was done in for Nuts and Bolts (a horrid game in execution--pretty much how the whole thing played, objective and plot wise--and fun in concept--designing crazy vehicles, even if they were mostly useless in trying to advance the game) but it also was more deliberate than how much it happened in the original Banjo-Kazooie... sort of like a line graph of Rare's creativity in contrast to their laziness (the more lazy, the less creative.)
Finally, if I remember correctly, didn't Miyamoto release SMW2 against the higher ups wishes to make it more like DKC2? I remember that much clear as day because it was Miyamoto who called DKC "vapid" stating that while the graphics were top notch, the gameplay left much to be desired. It escalated to a point where he said that he didn't like what Rare was doing with Donkey Kong, but then the two dueled it out with Donkey Kong Country 2 (a MUCH stronger entry) and Yoshi's Island.
Both were great games, so players benefited from them, but in my book... Diddy destroyed Yoshi. I had a little more fun with DKC2 than I did with Yoshi's Island.