The Supergirl/Flash crossover episode wasn't particular good because of the story, or the threat they were up against, but it was great because of how damn charming Melissa Benoist and Grant Gustin were, and their adorable chemistry. Me and my wife were grinning like idiots whenever they were on screen together. I'm not into the shipping thing, and never really understood the fascination with shipping characters, but I'm all aboard the SS Karry. SS Bara? I have no idea how this works.
I want to see more of them together, preferably in a better episode that we know the Flash and Supergirl writers are capable of writing. The Flash is a fun, fairly light hearted show. So is Supergirl. Out of the DC TV shows, ther my favorite. SG got off to a really, really wonky start, but I felt it recovered once it got over its fixation with name dropping Superman every episode, and started letting Kara stand on her own. Really excited for Season 2 in general, not just because it jumped networks.