As in, I competed the Harley’s Revenge story. It was DLC in other versions of the game, and if I’d bought it as a separate purchase I’d count it as a separate completion (like I did with Fallout New Vegas and Bioshock 2 DLC), but as it’s on the disc, I’m not sure I can do that here. Either way, it’s done.
It was pretty short, and the actual map you play on was tiny (and reused over and over and over), but at least it wasn’t the Steel Mill again (well, aside from a short bit as previously mentioned). Harley was a complete pushover at the end, and the bomb defusing against the clock was annoying as you didn’t really know where they were and the “detector” to tell you wasn’t a lot of help.
Still, it was fun, and although playing as Robin was sadly over too quickly it was well worth playing.