It is not abnormal to have stuck pixels. The most I´ve heard about is three, but then again on the Aura and Glo, even so, with only three people complained and got exchanges and refunds. The stuck pixels should not affect the life or functioning of your device. Then again, should not. Personally if an exchange is easy I would go for that option.
Other Aura HD owners will be better suited to say whether that many stuck pixels is anywhere near normal (after all, higher resolution means more pixels to potentially get stuck).
The other question is how much they bug you. Can you live with it? As Anthem says, you might just consider them ink blots like on old fashioned books =)
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