I agree that One Hot Minute was a decent album (I'd have been happy to play on it), but yes, BSSM and Californication are truly outstanding, and By The Way, although not as strong as its predecessor, was still a great album (I quite like Zephyr, at least the verses). As I think most people agree (although not on which songs should be in/out), Stadium Arcadium should have been a single album. Given the last two however, I suspect their next album is going to be their last and a sad goodby unless they pull something magical out of the bag.
With JF back, they might just do it.