Cabal are mostly slow. So they can be out maneuvered even at close range. Hive have proven to be very easy to kill except sword Knights, but with no range are easily dealt with. Fallen with tracking rounds and camo will be very dangerous, but minotaurs seem to be the most challenging in close quarters. Powerful weapons with the ability to teleport and highly aggressive make them extremely difficult to deal with. Not to mention their lack of a crit spot.