This all could be said for the CW-verse. Firestorm, Captain Cold, Killer Frost, Gorilla Grodd, and freaking Mad Dog have been in these shows recently.
Whatever gets you into the wacky, wonderful world of comics is great. DC has a lot of weird in the margins. Blue Beetle has been around for a long time, just more often as Ted Kord. In fact, Blue Beetle was inspiration/going to be Blue Beetle in the Watchman.
The only bummer about Injustice being your in to these characters is that it is just about the most cynical possible look at them. Except maybe CW Arrow, which still appears to be attempting to be Batman.