It would still be better than Rhino if it was a warrior card because of the abundance of great cheap pirates (not just Bloodsail Raider) available and the fact that it can be generated for free from Juggernauts. Outside of that, Smite will always be superior by itself to Tundra Rhino, which needs set-up and/or buffing to even deal 6 damage in the first place.
It would still be better than Rhino if it was a warrior card because of the abundance of great cheap pirates (not just Bloodsail Raider) available and the fact that it can be generated for free from Juggernauts. Outside of that, Smite will always be superior by itself to Tundra Rhino, which needs set-up and/or buffing to even deal 6 damage in the first place.
If Smite is a 6 mana Tundra Rhino, then I guess Leeroy is just a Tundra Rhino without any of the synergies.