My belief in XMR's long term success over darkcoin has more to do with the coin's fundamentals than any perceived scamminess in DRK.
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Monero has zero dependencies. Regardless of a masternode's "vulnerability", DRK still depends on them to ensure privacy. XMR works out of the box. Just use the coin.
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Monero is not a Proof of Stake currency. Even Ethereum's Vitalik Buterin admits that a secure PoS system is somewhat of a unicorn, though
eventually achievable. Even if it is achieved, I don't believe PoS assets can ever be valued on a massive scale and remain decentralized (see the first law of thermodynamics).
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Monero's blockchain is opaque. You cannot see the contents or transaction history of my (or anyone's) address, even if I make it public. This is not the case for Bitcoin derived alts.
Point 1 is true that DRK's privacy functions on the backbone of the masternode network, but even if the network were compromised tomorrow, all previous transactions would remain anonymous. Correct me if I am wrong, but if by some act of god (and excluding the ramifications of hash security not only on a mining level but on all systems secured by cryptography (yes you SHA256) being compromised), cryptonote was broken, all tx's (past, present, future) would be linked. It's a choice between on chain or off chain privacy.
Point two isn't right... DRK is, and always will be, a POW currency. Masternodes are dubbed as proof of service from posting collateral to partake in rewards, but beyond that, it all comes back to miners that process transactions and divide out the masternode percentage payment from the block reward.
As for point three, true, but what good is a ledger of tx's if the whole thing is obscured as to origin? I'm sorry, but having a 1 in 6561 chance at 8 rounds of viable pathways in the blockchain is fine. While it may not be true anonymity in the sense that it's cryptographically unlinkable, it's privacy through obscurity. Even so, the end user has the choice of how much obscurity he or she wants and further could re-DS if so desired.