That is because Robinson came at a time where that #2 pick value, you were getting entire drafts for it.
That wasn't taking place back when Smith was chosen.
But how bad was Smith to be worse than Robinson which I don't dispute. I do think Robinson's lack of Football IQ may have been a contributing factor to Fisher's 5 play offense so if you factor that in, it is probably very close.
1) Run it right into the line
2) Run wide
3) Receiver go out 10 yards and turn around
4) Throw it deep up for grabs on the sideline
5) a reverse run