Yes, he is. Kurama's strength is well known and feared throughout the Naruto universe. A little demonstration of Kurama's fearsome might got displayed during the 4th Great Shinobi World War, where he single-handedly fended off five tailed beasts at once. And the crazy this is, Kurama wasn't even at full strength. As you might remember, half of Kurama's chakra was separated and trapped inside Minato, so he was half his strength when facing the tailed beasts. What a monster.