This thing. Armored. Slashing you with the gleaming powersword. Stuffing you with tiny monomolecular blades, wrecking your nervous system with every sound. Love this picture!
Personally I think I did quite well as an Assault. Don't see how an entire enemy team having Meltas stops you getting kills.
The point is that melta-squad can faceroll anything and everything but Heavy-flamer-wileding dudes in close confined space. ANd space marine players shit their pants because not Power armour, Marine epic balls-out toughness nor even TDA won't save them from it.
It all comes down to whether you like faceguns or lades with large and prominent assets. So what'll it be?