Before beginning the review, let me clarify that I'll be reviewing this special episode as a Recap episode as this one is. In a recap episode what matters most is how well they summarised the story.
→Are all the major events covered?
→Whether the story is smooth or glitchy?
→How apt is the background sound & narration?
Basically to sum up, its more about enjoyment factor rather character development & artwork.
I personally find this recap episode to be a disaster. No doubt they covered every major event but what lacked was a smooth story transition. It felt like watching a one event after another without a
sense of story. They tried to link the scenes via adding narration but damn the narrations were horrible. (Referring to the English Sub version)
The bad part of the narration was not just the narration style (Narrators'point of view) but also the fact that narration overlapped the original dialogues playing in background in the scenes. They didn't bother editing the same properly. It was a mess. Background sound effects, though were same as original series, but didn't do well in this special.
This special felt more like made by a fan having barely workable video editing skills rather than the animation studio itself.
I would recommend watching this special only to those who wish to learn what not to do while making a recap episode. For a rational anime fan this is just a disaster nothing more than that.