It's around 3,5. Sorry not sorry ;) 
 Better than the 2nd one but not as captivating as the 1st. The reveals are great and the world building really was fascinating. I mostly got bored at those so many useless pages that could really be cut: the repetition of Elend and Vin thoughts about their relationship and who they are and who they want to be...Sazed whining because he cannot find a perfect religion... There was wayyyy too much of it. But still less than in the 2nd book omg I couldn't take it anymore in the well of ascension. 
 Also I wonder why Sanderson still seem to think he has to explain hemalurgy or feruchemy (and even still some allomancy) hundreds of times, even on page 700 of 724 from the 3rd and last book. WE GET IT, STOP EXPLAINING THE SAME THING OVER AND OVER AND OVER AGAIN. Idk, it annoyed me that he felt like he had to explain it every time he used it, it's not THAT complicated. 
 As my fav character was Tensoon I was quite sad it just ended like that... 
 Also, the way Cett Was treated because he was handicapped ? Not cool. 
 Finally, and this is very important, even though there is a strong female protagonist, it's not enough. Every single one of the other characters are men and the others are women who are only here to be the love interest to the men and thus helping their character development.