What i have gathered so far:
Buying tokens for the boxes is useless. They typically give you crappy epic items.
No matter how hard of boss you grind, you get the same crap. It is more efficient to grind the lowest one.
I havent tried big boy on insane yet. Maybe it is different.
I probably game about 3 hours a day. I am not expecting nor do i care to be to be top dog. However, from reading this, i appear to be at a disadvantage to older players that got more frequent, better drops. I do not want to pay money for the crappy mechs they keep offering, or gamble i may get decent items on boxes bought with tokens i spent real money on. I have gotten few actual legendary parts right off the bat.
That is my synopsis thus far.