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Hardy's been all over the place on defense though never below average. Not sure where Taro is getting 4.5-5 wins from...Betancourt is a 1-win fielder, Hardy is probably a 3-3.5-win fielder (above average but not spectacular)...Betancourt is a 1-2 win bat before this season, Hardy might turn out to be a 4-win bat if Safeco doesn't kill him.
Things to like about Hardy: he certainly plugs the infield defensive hole, he'll be reasonably dangerous on the road, and draws 3.9 P/PA...something the Mariners need rather badly.