Ainge got robbed
Not really. Not if you don't think Markelle Fultz is really the #1 player in this draft. If Ainge really preferred Jayson Tatum or Josh Jackson, then moving down 2 spots while getting another lottery pick is a major win.
The only reason you think its robbery is because you falsely assume Fultz is actually the #1 player in this draft.
If Ainge picks Tatum 3rd overall, he would have won this trade in a major way.