Chavez aged sooner than most people think and most people only see CHavez's career when he was on his downhill slope.
Chavez prime was
130lbs - 135lbs - The beginning of his 140lb reign. Believe it or not even when he beat Camacho, and Hernandez he was already on a downhill spiral. He wasnt training the same, his legendary conditioning was quickly deteriorating, he didnt even move around in the ring the same.
In his prime though he laid a beating on the who's who of the 130 (martinez, Mayweather)- 135 (rosario) and ended the career of a very special 140lb fighter by the name of Taylor. If thats being overrated, then yeah he is over rated.