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Look at Facebook, they took the same route with their apps. The reviews on the app store were horrible, and it now appears they will be making a native version of the app.

Because:

1) Native apps are more responsive than generic web apps(?)

2) Distribution is easier/monetizable

3) You get OS-specific interface elements for free

4) In this specific case, there is no other way to run HTML5 apps in the Metro UI on Windows RT (Win8 for ARM)

That's what Apple originally planned with the IPhone. Make the browser as awesome as possible to support web apps. I guess people aren't that into it. :P