i got it right around the curse of osiris expansion. i loved it back then, but im starting to think that i only loved it because of how late i came into destiny 1 and loved d1 so much. i started to get a little annoyed just before forsaken came out. then i just got flat out bored of it and chalked it up on the chore board after completing forsaken campaign
edit: i got destiny 1 just as taken king was released. i've read from many sources that taken king is what made d1 good