I suppose, in a way it was a cliffhanger, but it's more like an unsatisfying ending. I'm not sure how much of the manga is covered by the anime nor if the anime ending is the same as the manga ending but the last episode of the anime gave a feeling of leaving too much detail unresolved and a few questions left unanswered or ambiguous.
I had once binge-watched Attack on Titans two seasons in 3 and half day. Still I like Naruto Shippuden better.
These days...my mind is full of The Founder of Diabolism *fangirling mode* WANGXIAN!! [ These couple is forever in my heart]