If I understood correctly (bear in mind that this rarely happens 
) fluffypony was referring to the possibility of MITM attacks.
) fluffypony was referring to the possibility of MITM attacks.In part yes, but also malware on your computer. There is no substitute for cold storage, paper wallets, good hardware wallets, etc.
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So, afaik, there is nothing less secure with the wallets created with mymonero (discounting the 13 vs 24 word mnemonic).
If you, for whatever reason, used mymonero to create a coldish wallet, and never login again, you should be pretty safeish.
If you, for whatever reason, used mymonero to create a coldish wallet, and never login again, you should be pretty safeish.
That is true assuming you are completely sure that nothing was compromised when you created it. Hard to really know that.