I think TTK was great but they are making it very grindy. There hasn't been a big release of guns and gear. People are generally looking the same and using the same few guns. The raid is pretty much just being farmed now and we pop in for a new timed released exotic now and then. The fact is that the game is just lacking content and people are getting bored. Destiny needs a major content release and every installment just feels like a DLC.