Boo, Raiden, yay Hellboy. If there had to be another guest character, I'm glad it's him and not someone else. He looks awesome. Shame his animations will look wack, though, so it's kind of a waste.
Black Manta is cool, but having just one DC character in this pack is ridiculous.
I wonder how people calling Guests in MK and Injustice "a waste" feel about Akuma and Geese in Tekken
Tekken has a bigger roster and fewer guest characters, and those guests are less likely to push out veteran characters. We also don't know what Tekken's DLC plan is outside of guest characters. IJ2 meanwhile, as far as we know, there's only nine DLC characters, which might be it (since MKX had eight), so the more guests, the fewer DC newcomers. This DLC pack also just has a single DC character, which looks bad for those wanting DLC characters.