It probably won't be unfulfilling for you if you've never played it. The new player experience is good, you may be overwhelmed with things to do at first when you hit max level though. If you want to give it a try I say go for it. We're all tainted by the game in its best state its ever been in, during Legion, coming into this expansion it feels like they dropped the ball significantly. But you didn't experience any of that shit so you may actually really enjoy it.
Unfortunately dungeons are all go-fast murder fests since everyone knows what to do and has gear for their alts so you won't really get any real feel of the game at all until you're max.
I'd say go for it, but just try out the level 20 free trial first to decide whether or not you enjoy the combat, etc. If you don't then don't bother. It gives a good feel for how the game plays later (albeit you're missing some skills and your character will likely play faster at max, etc).