Yes, this is on the list of Ultimate Gamerscore Whore Games. If you've played this game, you're either so shameless about getting gamerscore you don't care how it looks on your card, or you have a young daughter.
Those are about the only reasons you're going to be playing this game.
That's not to say it's terrible, though. Actually, the musical sequences (while full of lots of stars, hearts and glitter) have some interesting minigames. While Hannah, er, Miley, er, Hannah is performing her songs, you need to move your controller in time with certain visual cues. These cues vary between dance steps, hand gestures, and even instruments. There are short minigames for guitar, drums and vocals as well.
And then there's the shopping! And the fairground games! And the errand girl runs to impress her wannabe boyfriend! Luckily, these aren't too onerous. In fact nothing about this game is really that onerous. If you're willing to spend 4-6 hours (tops) running through this, the 1k is yours.
Without the easy points, though, I wouldn't pick it up. The graphics are last gen, the story is inane, and the music is... well, you know what it is. The fairground minigames are slightly frustrating, and I found myself having to redo them to get tokens to buy the 100 articles of clothing for the last achievement. A little annoying, but not terribly.
In short, the game is what it is: a game targeted toward young girls that happens to have easy achievements for quick points. On the other hand, the game could be a lot worse. I actually found this fairly enjoyable for what it is, and not much of a grind at all.
3 stars, mainly because the easy achievements came at relatively little cost, both in terms of time and annoyance. Not a great game, but not awful.