It?s no secret that SUVs are indeed where it?s at these days. Even for established luxury brands like Mercedes-Benz, the more SUVS you can shoehorn into your lineup, the better off you?ll be. Well, we have this new entrant, the GLB, and it slots in, you guessed it, between the subcompact GLA and compact GLC. So let?s see if the B offers something ...