BAD THING: You know those comics which claim to tie-in to a bigger storyline that are just an excuse to get the regular readers to care about the crossover and a means of suckering in all of the fans of the crossover who wouldn't buy this book any other way? This is one of those comics.
On the bright side, at least there's three pages of history explaining who the Black Lantern Doom Patrol members are and and who the current Doom Patrol is for those of us who don't read Doom Patrol. So at least you don't spend the whole book confused as to who is fighting who and why. That being said, there's no reason to buy this book if you're just interested in Blackest Night.
GOOD THING: The real treat comes at the end of the issue, where there is a non-Blackest Night affiliated story about The Metal Men.
Now I know what you're thinking - why do I care about the Metal Men all of a sudden? I don't. But I do care about anything Keith Giffen, J. M. DeMatteis and Kevin Maguire do together. Because it's always worth reading and frequently hilarious.