I remember posting about it, but here it is again:
Baseball reference differences them as "power" and "finesse" pitchers, here are Ortiz' 2009 numbers against "power", "average" and "finesse" pitching:
Power pitchers: .242 /.329 /.530 .859 OPS.
Average: 238/.335/.459 .793 OPS
Finesse: .237/.331/.425 .756 OPS
Since the differentiation is made basically on pitcher's stuff, the numbers would seem to indicate that Ortiz had significant problems adjusting to soft-tossers and garbage-throwers, which makes sense, because he seemed late on fastballs and early on breaking balls throughout the first half of the year, and it's easier to cheat fastball on a pitcher who throws hard and uses his FB as an out pitch a higher percentage of the time.