Ah, I rather enjoyed a monster series by Adrian Tchaikovsky with a nifty conceit involving insect 'kinden' Starts off with Empire in Black and Gold and trundles through another 9 books. My patience with these weighty series is limited (even trilogies get on my nerves) but I sustained my interest with this lot.
I also rather love CJCherryh (apart from her rambling and dull Inheritance series-also fucking endless)...but just about anything else she has written, even some of the slightly twee stuff such as Chronicles of Morgaine is pretty OK ...plus she has written shitloads.
Another vote for Erikson but unlike Dotty, I never warmed to Esslemont.
Guy Gavriel Kay...OK.
Jacqueline Carey - a whole heap of books starting with Kushiel's Dart (mild s&m, alternate medieval Europe. Got through all of them too.
Sherry Tepper. I used to love The True Game series (but thought it was a bit dodge on a re-read), Grass still her best but quite a few of her middle range worth a look (she did eventually veer off into some dreary eco-hectoring with drivel like 'The Margarets...and I hated 'Beauty'..
Lies of Locke Lamorra - Scott Lynch. Annoying tbh. Bloody brilliant first book, 2nd slightly less so 3rd rubbish and frankly, the zillion year wait for the promised 4thn (September- scoff) can go on forever - the law of diminishing returns so be warned.
Christ, there's a lot of tosh though...to find the odd pearl