I really didn't expect too much out of this at all, but this was a huge joke. Bolvar is recruiting allied race DKs cause he expects Sylvanas to be making moves soon, and even says so much in the lone "quest" you do. But despite that... Darion just says to hone your skills and sends you off on your way, and that they'll be making contact to you "soon" (hint: they probably won't).
This didn't even have to be a long questline, perhaps investigating some things or rooting out some loyalists scouts, something to bridge into Shadowlands a little bit. But blizz went bare minimum with this, and wasted a new soundtrack that will probably only be used in this "zone."