It comes down to how you play it and if you enjoy that kind of game. I happened to love it, I certainly had way more fun with AC than R&C and Uncharted demos. I don't think it's a big mystery why it sold so well.
Looking at its first day sale, it seems that AC sold really well initially based on its concept, artwork and marketing (There is no AC demo). I think many gamers are attracted to open gameplay, macho game characters, and aggressive theme (assassination). AC doesn't have any online mode; it was also criticized by some for being short but that didn't stop it from making the chart.
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