I see people who want to define success in absolute terms which is a (remarkably) foolish concept; what determins success is relative to the particular game. Heavenly Sword can be considered a flop while Zack & Wiki can be considered a success even if Zack & Wiki sells far less units than Heavenly Sword. Comparing Zack & Wiki to Heavenly Sword is like comparing Apples to Ford Mustangs (Note: two things that are not alike) Zack & Wiki is a third party budget priced old-school point and click adventure game (read: currently unpopular genre) with a tiny marketing budget which could be considered a gigantic experiment, Heavenly Sword is a first party big budget action game with a massive marketing budget; it is likely that Zack & Wiki will break even at 75,000 to 100,000 unit sales while it (theoritically) could take 500,000+ units to break even on Heavenly Sword.
Ultimately, the only people who's opinion on whether it was successful or not that matters is Capcom; being that they seem (somewhat) happy with the sales, although a little frustrated with retailers, I don't think that the sales can be considered that bad.
