Countering a spell and possibly drawing a card is a huge tempo and card advantage swing
But news of Rakdos Aggro may have been exaggerated, as shown by a very recent Top 8
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Rendmaw triggers from artifact creatures, enchantment lands, etc., but it also triggers from a kindred enchantment like Bitterblossom or a kindred artifact like Altar of the Goyf
This meant that red decks, except for Burn, almost always had to be paired with another colour that provided removal for bigger creatures
Its technically playable, but I wont clamor to get this into any of my decks