I hate to say this, but Berkman's "terrible season" looks alot like Dunn's season, w/ a few less home runs.
Berkman now: .257, 15, 61, OBP .379, OPS .810, 62 bb, 80 k's
Dunn now: .269, 27, 63, OBP .371, OPS .922, 56 bb, 120 k's.
The difference isn't that much, w/ Dunn having a career year and Berkman having the worst of his career.