I actually love how calculating she is. I think it's been one of the main reasons she's managed to remain so successful, because she knows every step she's going to make before she makes them. It also lends itself very well into her catalog, because she weaves her albums from one to the next progressively in sound and maturity.
All in all, I think it's a good thing to make sure your public persona and image is well put together. It may seem as though she's too saccharine or plastic at times, but it keeps her in a healthy spot.
I only dislike that she's a bit hypocritical (she's quick to chastise when she feels wronged, but reluctant to admit fault when she's the wrong one) - it's an adolescent tinge in her persona that she should have outgrown by now, especially since she's been called out for it more than a few times.