What a strange example of a player who had to make you "come around" to appreciate him.
Pierre ran like his feet were on fire during his rookie preseason.......scored the opening TD on a muffed punt while playing special teams in the first win of that season for the Saints against Seattle.....and when given his first major chance in week 17 @ Chicago, absolutely lit it up. By 2009 he was probably the best screen-pass RB in the league. All of that while having been brought in as a UDFA and consistently being the ultimate team player and doing what was asked.
I would think better examples would be Ingram or Meachem......both of whom were #1 picks and were into their 3rd seasons before things seemed to finally click for them.