Marc, at fellow SB Nation site, Beyond the Box Score, has put together his usual stellar work, analyzing the recent signings by the Marlins.
His dissections cover the acquisitions of Helms, Olivo, Reese, and Borowski. Marc is a craftsman at his trade, and it would well behoove you, to see what he has to say.
I could copy it and place it here, but I'm not going to do that. You need to go to his site and checkout the excellent work he does.