While Crede's OBP is lousy, his career slugging is almost .450, or about 70 points higher than SF hit as a team. If he can stay healthy and hit like that, his fielding will make him pretty valuable. Don't forget that AL hitters switching to the NL tend to get a bump in performance, too.
"I don't want to play golf. When I hit a ball, I want someone else to chase it."