If you played any of the previous games, you know what to expect and probably already bought it :)
Don't bother with the GS review, they are so biased its nuts. They apparently are uncomfortable playing a cutsey princess main character, and spend half their time bashing the game for being cutesy, when that is essentially the entire point of the series. All the characters have unique qualities to them and are fun an enjoyable (esp totori and mimi). Maybe some of that got lost in the translation (i use the JP settings), i don't know why the reviewers think meruru is spoiled.
If you liked the previous games, you will like this game. If you never tried the previous games, you should give it an unbiased shot (something gamespot routinely fails to do these days). You won't be disappointed.