It's sad that respected developers arm these newbies with irrelevant half-truths and these newbies go spread those on the forums. In the end, they lose, because they start believing these now irrelevant half-truths and miss out on good investments.
None of them have been convincingly shown to be secure
Oh well, what do you think are the criteria for them to be considered secure by you, personally? How long should this or that PoS implementation be around to prove it's secure?