The standard formula for most "Blackest Night" crossovers has been Hero Protagonist(s) + Dead Teammate(s)/Foe(s) = Crossover Bonus. "Blackest Night: The Flash" is handling things a bit differently, since its protagonist is now also officially a Blue Lantern. There are some interesting glimpses at what exactly that entails. Seeing their constructs outside of the abstract wilds of space is interesting, as they pull from the emotions of the person being focused on, not from. Sort of like the Black Lanterns themselves, but in reverse. It's an interesting conceit, and it's nice to see a Blackest Night crossover fill in those sorts of details as opposed to just languishing in reanimated inconveniences.
While continuing what I suppose you could call his cold open for his upcoming Flash series that has worked its way through "Rogues Revenge" and "Flash Rebirth," Geoff Johns has cultivated the longstanding mythology of the Rogues that he began years ago on his original run on "The Flash." This continues here, as alongside Barry Allen's recruitment into the Blue Lantern Corps, we see Captain Cold and the rest of the Rogues beset by the dead Rogues of the past. All standard "Blackest Night" fare, but it is interesting to see how Cold avoids being ultimately victimized by them.
Scott Kolins has a style that you normally might not figure would be ideal for a character whose main characteristic is his blurring speed, but through sheer strength of style and time spent on Flash comics, his art has become a kind of trademark look for the character. Atiyeh's color work is also a great fit for his style: bold flats without sacrificing a sense of depth and dimensionality.
Now that "Blackest Night" is closer to its end than it is to its beginning, its crossovers are finally starting to branch into more interesting territory. We're all pretty familiar with what happens when a Black Lantern shows up. Regrets, chestplates coveted, people get seen in different colors, people try and kill Black Lanterns but they just end up doing that weird ropey thing and come back together, etc. But outside of all that, Johns is really expanding the mythology through more interesting detail, broadening the spectrum. So to speak.