Jameis has been pretty good throwing to Evans, Humphries, and Brate, but for whatever reason, he and DeSean just never got on the same page. Most of Jameis' passes to DeSean were not remotely catchable.
Still, DeSean finished the year as the #25 ranked WR from PFF and his advanced numbers are all pretty good. Tampa had arguably the best receiving corps in the NFL this past season and DeSean was a part of that.