After various hacking/phishing attempts on MyEtherWallet, it became standard to not use private keys on MEW or double-check URL before accessing account. Many people already lost faith in MEW and it really became difficult to access Ethereum address.
Then came MetaMask and solved whole problem. It works as browser-extension thus solved the problem of phishing attack all together. Secondly, seed-generation and input take place at client-side (not server-side). Thus user's seed is not saved anywhSee full review