If I'd read this when I bought it in 1981, I'd undoubtedly have rated it higher than my present 3🌟. As it is, I enjoyed it for its type, & Moorcock's unabashed borrowing wholesale from Edgar Rice Burroughs' A Princess of Mars. There are few surprises, but then I read it for that reason. Comfy slippers.
Moorcock doesn't take himself too seriously, & I had a chuckle at the name of the entrance to the Caves of Darkness: the Gates of Gord Elpus! 😄