I suppose I am unique in that I don't hate the series and yet as a whole, I am not shamelessly in love with it. The first six books moved events along at an acceptable pace while taking enough time to develop the core characters. The first part of the series culminates at The Battle of Dumai's Wells (the end of Lord of Chaos) which remains the series most defining moment to date. The four books that follow (Crown of Swords, The Path of Daggers, Winter's Heart, and Crossroads of Twilight) accomplish little in context of the larger story, large sections being devoted to developing and over-developing minor plot threads while failing to introduce anything essentially new to the series in terms of story arcs or characters. The result are four painstakingly dull volumes that constitute nothing but a deep dive into a shallow pool. There are romances and character grandstanding that will drive you crazy along with this universal reluctance of the male characters to embrace their respective and very clear roles in the narrative. It truly does seem like Jordan spends these volumes exploring how the four primary male characters (Rand, Perrin, Matt, and Lan) are endlessly reluctant to embrace their roles and destinies while at the same time exploring how the world seems reluctant to embrace the roles of the primary female characters (Egewene, Nynaeve, Elaine, Min) who seem to have no problem being what they are.
As I mentioned, Sanderson seems to take no issues clearing that up in his two entries and drawing the series out of the doldrums and bringing the characters back into line. The series could have wrapped in a single book following Lord of Chaos and perhaps should have.
Concerning the value of the series as a whole - I think it will stand as a monumental series in modern fantasy literature, particularly when it concludes early next year. I really do think the consensus will be, when all is said and done, that Wheel of Time is an "essential" fantasy series. It has a massive fan base, as large as, if not larger, than any fan base out there save your Potter/Twilight/Hunger games reader (young adults) and possibly Lord of the Rings.