I havent been around for the past 2000 years, but yes he was an awesome pope. The best? i dont know, but i can say he was better than most (especially some of those embarrasing middle ages popes [note no matter how bad the man, they never taught error])
I woudl support styling him “the great” though. I think what set him apart was that he was not just a pius cleric and theologian living in an ivory tower, he brought the heavy and mystical truths of the universe down to an applicable level without comprmising them at all.