Fun with numbers...
Renteria's 3 years prior to his one season in Boston: .308/.362/.440/.802, 110 ops+, 3.9 bWAR (per year)
Renteria's 1 year in Boston: .276/.335/.385/.721, 89 ops+, 1.4 bWAR
Renteria's 2 years following his one season in Boston: .310/.374/.451/.825, 113 ops+, 4.1 bWAR (per year)