These days I am going through mechanics problems from level 1 to level 3. There are some serious issues which must be addressed about these I think. First, this guy submits many innovative problems and I think he works hard for creating problems. At the same time, I find that many times he posts wrong answers to his questions and doesn't even respond to disputes. As an example look at this problem. His problems are making my rating go down day by day and I am in 3rd level now. I am really surprised that staff hasn't looked into this issue so far.
Second thing is about units. I saw few low level problems where just to trick solver, unnecessary units like Mg (its megagram.. not milligram! ) are used. I think as far as physics is concerned, brilliant should make it compulsory to use standard units in all problems (like m/sec for speed). I hope that brilliant would take this issue seriously.