In a vacuum, contract/expectations aside, Dunn was absolutely an MLB quality player in both of those years and was a pretty good one in 2012. I don't think a .762-.800 OPS is necessarily Collins' best case scenario, but let's say that he hits .220/.330/.420 or something like that. If he can stick behind the plate, and so far there has been no indication that he cannot, then that's still a pretty valuable player.