Gameplay is tight and responsive, but your character has to fully complete her actions before she can begin another--this makes the game much more challenging than it would be with animation cancelling (there is some but very little and to do so usually costs capped resources). I'd agree with most that the other two games are more fun, because this one features far less crazy comboing; instead, this game demands strategic timing and positioning that the other two simply don't, with a much steeper punishment for failing to react appropriately to an enemy. The end result is still a good product, even if it isn't quite the same.
The atmosphere in this game is really captivating, and there isn't an area I found myself bored exploring. Trying to find if it's possible yet to get that item visible on the ledge but just out of reach was actually enjoyable, where in other games with less unique settings it would be a nerve-wracking headache.
Story-wise, however, this one does feel shoehorned in, and dialogue is sometimes frustratingly bad with some periods of salvaged mediocrity, and maybe a handful of surprisingly charming moments. Hopefully, enough people bought this 3rd installment and Genesis to justify a fourth, and hopefully, that fourth retcons or ignores some of the plot elements from Fury's adventures.
Should you buy? Depends. If you have another game in mind you know you'll enjoy, buy that first. If you're just looking for a new game and nothing in particular interests you, this could definitely be it.