It was bad.
First half of the manga was amazing, I was so thrilled, second half was pure trainwreck.
That last arc was the worst of all. Disappointed by how the author shat on his work.
Power-ups, asspulls, unnecessary subplots, unnecessary dialogues, poorly written characters (hi isley), deus ex machinas (that Riful 2.0 and Theresa), lack of plot depth and Claire was boring till the end.
If you think about it, Shingeki no Kyojin is a revamped Claymore, without all the crap that we got past 11th volume.
I am angry, it's even worse than how Naruto ended.