First 7 minutes isn't bad, but I can't say I'm fine with the portrayal of mobile suits. A zaku should not move like the god damn Unicorn lol. But that said, once the story shifts to 0068, things get quite good. For those that read the manga, it pretty much follows the first half of Volume 1. The episode ends with Casval and Artesia leaving Munzo. It follows the manga mostly the same from that point on. Minor stuff here and there, like Gihren playing Go when he speaks with Kycelia rather than gardening. The ova does seem to spell out more heavy handedly that Kycelia killed Sasro. But again, if you read the manga you know what to expect.
Production values-wise....well, it's definitely a step down from Unicorn. It mostly looks nice, but when there is CGI, it is kind of distracting. Especially for scenes like Ramba driving. But the CGI isn't terrible, just unfortunate. Definitely looks cheaper than Unicorn for sure.
Musically, it's not bad. Definitely not as memorable as Unicorn, but still effective at building an atmosphere. I hate to keep comparing it to Unicorn, but seeing as how it is the most recent OVA those comparisons are inevitable. One the plus side, the ending theme was pretty nice.