phished / keylogged whatever, you are adding another layer of security via Metamask, with which it already is easier to connect to MEW, so it's a Win Win
Its a good thing to have both of it. Metamask is a good wallet you can access it easily but it is more prone to keylogger and dictionary attack through its seed phrase. Myetherwallet is a good wallet with a decent and secured wallet. It is up to you what wallet you are willing to use. Just be careful and treat your ether wallet or bitcoin wallet like it have a million dollars on it.