You probably logged into phishing site which looked identical to original MEW; that's a classic hacker scheme which continues working even today...but that's one of rare ways to steal someones tokens...
The fact is that I consider MEW to be practically the best ethereal wallet that is difficult to crack or almost impossible. All problems with the users' funds are only due to the fact that the users themselves inadvertently use the wallet.
It`s clearly stated to check URL, to make sure that URL bar has MYETHERWALLET INC in green. I agree with
you Suslura, all problems are made cause not paying enough attention.
When you open MyEtherWallet anyone can go trough several pages how to protect their wallet. I done that
first time, it`s not hard. People should spend more time on reading important stuff, if they don`t do that they
are guilty for every lost penny.