I would take it a step further and say Out of the box the nook is not an "Android Experience" nor a tablet. B&N have not only bolted the security on the device, they have heavily modified the OS. What you get out of the box is their ereader app and a decent web browser.(For some reason they removed the pinch/zoom feature of the browser).
Once rooted you get the Android market and access to apps. Which will make the experience a better one. However because they have removed/modified so much of the Android OS many apps work wonkie or do not show on the Market.
However I took it a step further and installed an Android OS on my nook and that is when it truly becomes a tablet device. All the apps seem to show on the market and all the apps work as they should.
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