Of course, the hackers say that there is no safe place in cyberspace but that will happen if you do not make mistakes in keeping your key because all security provided in myetherwallet is useless if the users themselves are not careful. hackers usually use phishing sites to get information about your account and your security key so you should be able to distinguish this site, if you click on a phishing site then you do not realize that you have submitted your account information.
We do have the full responsibility of our own wallet which the site itself has nothing to do with it. All can be hacked on cyberspace but as a user we should really take all the safety measures on ensuring the security of our own wallet if we dont like to lose up funds then we should do our own homework. It might not assure you 100% but would really give you the confidence that hackers cant easily bypass it as long they dont have the keys then it should be just fine.