A couple like Thon and Papagiannis were never meant to contribute from year 1, and Ben got injured, but everybody else has shown flashes... just nothing spectacular so far. Maybe just a slow start, the talent is definitely there.
About Brogdon, everybody is curious to see what his ceiling is. The incredible thing is that the transition to the NBA has left his game pretty much unaffected, just a few more assists and few less shots because he switched from SP to PG. Other than that it's like he still plays against colleges instead of NBA teams, which is pretty effin unbelievable in its own right:

The other thing to remember is that this is his first true year of full time basketball, the guy was a real student up to last year.