The App Store is great on iOS. But I don't know how it will work on a computer, with more expensive apps.
As it is, installing most Mac apps is easy as hell anyway. Download the disk image, mount, drag the app to the Applications folder, eject disk image.
Yup, one of the main reasons I switched over to Mac six years ago. Now, if I could only get my job to buy me a MacPro instead of these Dell boxes I'd be good to go.