The Fit? Really? It gets rave reviews from just about everyone - including even jeremy Clarkson (as the Jazz, of course), which is saying something. Unless it says Ferrari on it he is usually not impressed. I drove the previous generation as a loaner and found it to be above par for an economy car (although revs VERY high at highway speeds)
And yes, the B and GLK are aimed at totally different markets - but they do manage to offer virtually identical passenger and cargo room, which is why I brought it up to begin with. The B competes more with the Mazda 5, albeit at a more "luxury" oriented price point.