I hate to say things like this, but yes, and no.
If you are a huge fan of the series, and must play every one, and can deal with some oddness, then yes, you must buy this game. If you are not all of the above, and you are looking for a great, up to date game experience, then no.
The game feels unfinished. The controls are as blocky as ever, which you get used to, but can be problematic. Many of her signature moves and game play elements are gone, replaced by things which seem half finished. There are slowdowns in game, possibly due to PAL to NTSC conversion. There are times when the game simply doesn;t make sense, (for instance you know you need to perform an action, but you cannot, only to learn NO you don't have to do it!).
I do enjoy it, when I am able to progress, but its not what it should have been. It is not as much of an advancement as it should be over previous versions.