I've never given much credence to market cap when it comes to how "good" a coin is, but in this particular case the PoS coins you named are pretty good as far as altcoins go.  I also noted your point about support for PoS being quite low on bitcointalk (not surprising given bitcoiners tend to prefer PoW).

I've always been a fan of staking coins, and while I do understand OP's point about centralization and so forth, I just don't think it's as powerful an argument against the protocol as it might sound.  That's a gut feeling of mine; if you asked me to give you a considered counterargument, I'd probably have to think for a few days.

On the flip side, there are some PoS coins that are extremely awful.  I'm talking RDD, NAV, Neblio, CURE, and though I hate to say it, PIVX (that one has always had a place in my heart).  And man, NEO is just criminally overlooked.