It's not that desperate, it's still a sound 3HKO. It's no more desperate than, say, Fire Blast Lax. And if you're using Tauros, you should be using it as a mixed attacker (e.g., Double-Edge/Earthquake/Fire Blast/Curse), not as that weak Sleep Talk set, so you have the space for it. Tauros has the advantage of being way faster than Kanga: fast enough to outspeed Zapdos. It also hits a little harder. These advantages are too subtle to warrant using it though (unlike Kanga's good CurseSubRoar gimmick).