I liked Steelheart. I loved Firefight. But while Sanderson will still be my favorite author, Calamity was NOT my favorite book. 
 Why? 
 I felt like nothing really happened in the first ~70% percent. And then the whole, imo not sufficiently elaborated alternate reality thing just seemed to bring an effortless convenient solution to a myriad of problems? 
 Too many questions were left unanswered, taking into consideration that this was (should have been) the conclusion to a trilogy. 
 There were plot holes. 
 The book as a whole felt a bit rushed to me. 
 I missed the incredible ingenuity and amazing creativity of Sanderson's other stories in "Calamity", or maybe I am already totally pampered by series like "Mistborn" and "Stormlight Archives". 
 The villain was a spoiled, lazy brat more than a villain, and his ulterior motivations remained hidden. 
 There were things I enjoyed, though - a special mention to the epic fight scene. To Obliteration. I LOVED Obliteration as a character. And the epilogue was beautiful.