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Yes, Moriarty has a bad reputation. Interesting that you were scammed that way: a few small orders go through fine, then POW!, he gets you. Very typical of scammers.
I have never heard of anybody having
real problems with
bitmixer.io (I use their service in the clear, I know nothing about using TOR). The only problems I have heard about are those relating to using an incorrect TOR site (!, careful) or otherwise not documenting their transaction with the Letter of Guarantee, the site strongly advises downloading and verifying it. Glitches can happen, but that Letter of Guarantee ensures that you have the proof you need.
And other than little glitches, I have never had a serious problem with them, I have used them quite a few times.
I advertise them because I use their service....