It is in a vacuum. Suramar was great because it was overall self contained and it kicked off the meat of all the campaign that eventually brought us to Argus. From there it was an Illidan spotfest carried by the fact that Illidan need no buildup whatsoever and the Legion had 20ish years of being *the* enemy.
Shadowlands and the Jailer are not that different in principle: a spotfest narrative with no substance.