Probably the best writing out of any of the expansions; didn't leave a ton of lingering plot threads, cleanly finishes up a lot of the threads it deals with, and very nicely transitions into Living World Season 4. Unfortunately the maps are huge and why are there not more waypoints. Added mounts, which is good. Added the scary raids, which I haven't done yet but will do one day. Added probably the most imbalanced set of elite specializations yet. (Mirage is lying in its grave. Scourge & Firebrand are doing everything forever.) Nobody does these map metas because their rewards are dogshit, what the hell, Arenanet; out of the expansions this one is the least likely to have people wandering around its maps because there's no reason to be there.

AFAIK these days it comes exclusively as a 2-pack with Heart of Thorns, and I really would recommend getting that 2-pack if you're remotely interested in actually playing GW2 after you hit level 80 for the first time.