In short, watch this if you like the series. If you're not that into it, then it is hardly a recommendation simply because it is the weakest one.
Pros: solid animation, nice OP and continuation of the main story.
Cons: ragged rhythm due to overly lengthy flashbacks and inner monologues, zero emotional development of the main character even at this point (he gains new moves, but hardly grows as his experience would otherwise suggest), new characters are a mix of good backstory and so-so.