"Ryuu Seiki" has decent art, but the rest of the technical aspects, including animation and sound, feel flimsy. The characters are difficult to sympathize with and have contrived backstories and abilities. The plots for both episodes, which rely on these contrived backstories and abilities to progress, don't make much sense. Also, since this OVA is just two 30-minute episodes, which each tell separate stories that are only loosely tied together, events happen so quickly that it is difficult to comprehend what is going on at times. It ends on a cliched note.
There are worse OVAs out there, but this one is not particularly good; it's mediocre at best.