In his season with his best FIP (2008) of the last four years he had an ERA of 4.67, his highest WHIP, SLUG, and BB totals in three years.
All that tells me is that FIP is a very good theoretical stat. But it is not great at correlating to actual production.
To add to my arguement, a quick fan post from a White Sox fan.
Simply a very good pitcher (2 or 3) but not what the Braves needed.
(where's a beer so I can have a victory sip?)