So that's where they put the rest of the game everyone was expecting from the start!!
Really does add to the idea that they had a full game but chopped bits out to turn into dlc. Enemy names are already on the disc, the 3rd subclass slot is already waiting. This isnt content created after the disc was released.
It's not quite the same though. I very much doubt they had all the DLC content completed, ready to ship in time for the original release and then decided to hold it back just to make more money from it. Like any large project, there would have been an original, larger scope, then as time started running out, parts of the game would've been prioritised over others. I don't doubt that large parts of the DLC are already in place but I expect it's all very unpolished, untested, and needing a lot of work.
I definitely don't mind paying £17.50 per DLC pack for a game that I've had almost 400 hours of enjoyment out of. Other than Football Manager and, maybe, FIFA, it's been the biggest gaming bargain I've had in that regard.