Chicken Little and Valiant -- both 5.7
The movies that, in my opinion, were the best animated 2005 movie I saw and the worst animated 2005 movie I saw both have the same IMDb rating.
My favorite animated 2005 movie -- Chicken Little
.....my rating -- 9
.....IMDb rating -- 5.7
.....Very underrated.
My least favorite animated 2005 movie -- Valiant
.....my rating -- 4
.....IMDb rating -- 5.7
.....Slightly overrated.
This is just my opinion.