Even the majority of the member here in the forum said it is not safe anymore, I think I am not the only one believe on this matter. Because until now I am still using mew for a couple of years and yet so far I don't encounter any such suspicious things using it. Maybe for others it is not safe because some are not careful and became neglectful in keeping their private key something like that.
Most of them have been trapped by phishing scams and their money stolen. Because of lack of knowledge on their part they put the blame of MEW being not safe. However this could be prevented by some steps which veteran users already know. You cant help them if they dont take the advice.
Using a bookmarked MEW website, using the Metamask addon on your browser - these two steps take a long way for saving a user from being robbed. Additionally keeping their private keys safe and they should be all good to use MEW as a wallet.
Still if someone is very concerned, I suggest them to use a hardware wallet.