Off-hand, I can't recall having read any stories that teamed Superman and Batman's primary teen sidekicks. Batgirl and Supergirl, yes. Robin and Superboy, certainly. But Supergirl and Robin? I can't believe this is the first but I'm certain this issue of Injustice 2 is probably the best.
Tom Taylor's most amazing feat in this series and the previous Injustice comics has been inspiring sympathy for those characters the original games painted in a primarily villainous light. Opinion is divided on Damian Wayne in the fandom but Taylor's portrayal of the character here breeds uncertainty as to the believe that his Injustice incarnation is wholly irredeemable. Of course this could all be a ruse but it is a credit to Taylor's skill as a writer that he can inspire such uncertainty and the character moments featuring Kara and Damian confiding in one another are the high point of the issue.
Mike S. Miller and J. Nanjan are an equally excellent art team. There is a certain sense of clarity to Miller's pencils and inks that is hard to define and Nanjan's colors are bright and lively. Ironically, this is the only flaw of this issue - things look too bright and streamlined for a comic that is primarily set at night.
The Final Analysis: 8 out of 10.