Here is how I'd rate the series' that Ive read currently. Something like the Mistborn trilogy, which I did love, is probably getting a slight boost as a total package, particularly over the three unfinished products below it, even if I might rate them generally lower one on one against particular volumes from those series.
Lord of the Rings - Tolkien
Harry Potter - Rowling
Mistborn - Sanderson
Malazan Book of the Fallen - Erikson+
A Song of Ice and Fire - Martin*
Stormlight Archive - Sanderson*
Tawny Man - Hobb
Wheel of Time - Jordan/Sanderson
Liveship Traders - Hobb
Demon Cycle - Brett
Farseer - Hobb
Kingkiller Chronicle - Rothfuss*
Rain Wilds - Hobb
His Dark Materials - Pullman
Inheritance Cycle - Paolini
* Ongoing
+ Reading not complete
Lord of the Rings - Tolkien
Harry Potter - Rowling
Mistborn - Sanderson
Malazan Book of the Fallen - Erikson+
A Song of Ice and Fire - Martin*
Stormlight Archive - Sanderson*
Tawny Man - Hobb
Wheel of Time - Jordan/Sanderson
Liveship Traders - Hobb
Demon Cycle - Brett
Farseer - Hobb
Kingkiller Chronicle - Rothfuss*
Rain Wilds - Hobb
His Dark Materials - Pullman
Inheritance Cycle - Paolini
* Ongoing
+ Reading not complete