Yes it is a safe wallet, its one of tge widely used wallet since most tokens are based on it. But the problem with myetherwallet is that it coukd not hold other kind of coins specifically the well known stable one. Personally, I'm using a wallet that offers the same security myetherwallet could offer, it is the HODLER wallet. It is the only open source multi asset software, this mean you could view the codes and see for yourself if there is risk or potential vulnerability in the funds you store, this wilk help you easily and quickly fix the issues. Hodler could also hold ERC20 token and coins such as Ravencoin, BTC, BCH, LTC, DASH, ETH and many more coming.