CryptoNote doesn't hide the amount and the payer is mixed with a limited number of numerous other potential payers, so the IP correlation can be used to narrow the possibilities statistically and home in on identity, by observing patterns across all users. Thus the lack of IP address obfuscation in CryptoNote (assuming Tor is really a honey pots, and or most users fail to employ Tor) reduces the anonymity. -gmaxwell
While it may not be able to scale at Bitcoin levels, Monero's chain atm is twice Bitcoins, which is very reasonable considering it gives the highest level of anonymity there is for cryptocoins right now. He also doesn't say Anything about it being impossible to reduce, why you may ask? Because Crypto_Zoidber already reduced it for his own coin and reduced bloat by 50%-70%, and Monero also reduced the majority of the bloat, which was caused by dust transactions.
Again, BrilliantRocket, it's either you greatly misinterpret information given to you, or you lie and try to manipulate others with selective wording _______________________________________________________________________________
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CoinJoins algorithm suffers from not being atomic and thus it can be repeatedly jammed by an adversary, i.e. denial-of-service. This is because first the inputs have to be collected, then the outputs have to blind signed with a group signature, and then finally all inputs have to signed. If any one of the participant senders fails to complete all the steps, the transaction is jammed and the process must start again. All proposals for throttling or blacklisting adversaries was argued to be ineffective and intractable. Darkcoin innovated CoinJoin by adding a collateral payment which is forfeited by participants who fail to complete all steps. This requires a random master node to break the unlinkability as it knows the matching output of each input. It is assumed that not all master nodes will be adversaries and thus sending multiple times through different master nodes will provide a probablistic level of unlinkability. The master nodes are purchased and it isnt clear that a sufficiently powerful adversary couldn't sufficiently Sybil attack by acquiring a larger percentage of the master nodes. There is also concern this might also enable the adversary to steal collateral payments. Also the master nodes arent untraceable and thus could perhaps be held liable by governments for breaking AML and KYC laws. CoinJoin and Darkcoin suffer from the simultaneity timing problem that other spenders need to send spends of the same amount simultaneously. -gmaxwell
Gmaxwell also shows that while Darkcoin have "advanced" coinjoin, it still suffers from the same issues, not to mention the Masternode centralization problem.
Darkcoin's anonymity is simply put, Trivial and Inferior to Cryptonote anonymity.