Starfox Adventures starts out a great game that, as it progresses, it slowly becomes apparent that Rare stopped caring. As the game nears its finale everything begins to unravel a bit. The polish begins to drop off, the storyline basically peters out... the last fourth of the game does not feel complete.
And then the final boss... what a cop-out.
A few years ago some Starfox fansite actually went digging in the SFA ISO and there's huge, massive chunks of Dinosaur Planet's script still contained in the game, unused. The original plot of the game was very different. In comparison, SFA is a shadow of what Dinosaur Planet was going to be.
Maybe we need a Starfox Adventures thread, I dunno.