I had never read Burroughs, but I just read "A Princess of Mars" for the first time earlier this month. I wasn't as impressed as I had hoped. I thought it started off okay, but the hero gets more and more full of himself as he goes on. He is way too "perfect". He learns the language in just a few days, and can also read their minds but the can't read his. He has superior strength, skill, and intelligence, and is able to befriend each warring race separately. He is always at the right place at the right time to save the day, etc. And why does no one notice or mind that he is an alien who is actually killing a lot of their people?
Ate least I now know who John Carter is. But he is too much the stereotypical "hero" to hold up today.