Literally unplayable without Taken King.
On launch it had maybe 20 hours of content before it got boring which was unforgiveable for an MMO. After Taken King though, it became significantly better. Still not "game of the year" or even really above average but damn, the guns felt really good and I played waaaaaay too much of this with my best friend in college.
Never got into Destiny 2 tho cuz nothing carried over.