Normally I don't like rating things less than a 6 because that makes the anime seem really bad... but...
-Overall
The "special" isn't "special" at all. It's basically a recap of SAO in 2 hours, with about 10 minutes of new content. So, it's pretty much just watching the series again. For some people, that's alright, but I didn't really enjoy SAO all too much to begin with. When I decided to watch the special, I expected new content, not just a recap of the entire series for 2 hours...
Story: 0.1
Art: 6.85
Sound: 6.9
Character: 4.75
Enjoyment: 0.01
Overall: 3.722 It's poor, but if you really want to watch SAO again, I guess it'd be decent for you. More details below.
-Story
Kirigaya Kazuto a.k.a Kirito is being asked about the SAO incident while the girls have fun at the pool. He basically recaps SAO season 1 in 1 hour. There's practically no new content. Just a recap. For 2 hours. So... I don't think you can even say there's a story in this.
-Art
It looks fine.
-Sound
I enjoyed the voices, they aren't especially bad, and the soundtrack is still good.
-Character
Well, the characters could be better, but they most definitely could be worse. For the most part, they seem genuine enough, although Kirito is basically just a reincarnation of "stereotypical male protagonist." and Asuna is boring as all hell, while the other girls are all pretty boring too.
-Enjoyment
I did not enjoy this special. It was really bad.