In 2k15, you were pretty much matched up either by height or by position (to guard your opponent). In 2k16, it's seemingly random or depends on the order that you called "Next. " I've played back to back games against the same team and have guarded the smallest guy and the tallest.
This is retarded. My 6' 3" PG is ill-equipped to guard a 7' 3" beast that can back me in all day while my Center teammate chases around a midget PG.