The first book is a lot harder than the other books in the series. It is more or less something that is universally accepted and the author has even commented that if he had it to do again the first book would not be as difficult as it is.
If you like it all stick with it and it will get better.
Of course, the last book in the series is the single most disappointing thing I have ever read. I can tell you with no hyperbole that I have never in my entire life disliked anything as much as I disliked book ten of that series. After reading nine massive book I put book 10 down after a month of excruciating drudgery at the 60% mark and will never touch it again. I still don't know how the series ends and that book was such a self indulgent piece of shit I honestly don't care.
Erikson took his love for writing pointless sections that do nothing but display a philosophical point and took it to the absolute extreme. Book 10 is literally 100% mind numbing character introspection. The plot grinds to a complete and utter halt as he jumps character to character having them wax philosophically about everything that has happened to them in the first nine books so that he can underline it with some revelation. He boiled the majority of the plot lines down to nothing and abandoned them just to get them out of the way and what we have left is literally unreadable drudgery. He literally wrote nine books so that he could con us in to reading his personal musings about life for 1000 pages. Self indulgent, back stabbing asshole.
Books 1-6 = best fantasy ever written
books 7-8 = worse but still good
book 9 = moderately awful
book 10 = The single worst pile of garbage ever committed to paper
Steven Erikson is dead to me and I will never read another word that man writes.
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If I have burnt my bridges I will walk on water.
If you're on the shore, then you're sure not me, oh
My seething wrath and urge for blood is fueled by searing hate.
I'm X X X bitch, triple X rated.