Well it took me about 2.5 months to re-read the series and read the 4 books I hadn't read. I had previously read books 1-11 (many of these multiple times) and had read the shorter version of New Spring. After finishing the last Jordan book "Knife of Dreams" I vowed I was not going to touch the series again until it was finished. I decided for this final read through of the series (at least for a VERY long time) I would pick up the novel version of New Spring, so there were 4 I hadn't read. I think I read New Spring sometime after book 4-6.
Reading them back to back does really help make the slower books more tolerable. I remembered being so fed up when some of those books came out and I had diligently reread the whole series only for the plot to barely nudge forward. Here is my basic feeling on the book quality and pace:
1-3 - Awesome. The books are all great and the plot moves along well. You don't really know how big this thing is going to get, and it often feels like Book 3 will be the last book in the series.
4-6 - These are all still very high quality. The pace of the story definitely slows down - especially in book 6.
Book 7 - The slowest book to this point. From my point of view, nearly nothing happens for the first half of the book but the second half is really entertaining.
Book 8 - The slowest and worst book to this point. Very little is going on and at this point I was getting really frustrated with the series.
Book 9 - Much better. More interesting things seem to be happening here, and a big plot point is resolved.
Book 10 - Definitely the low point of the series. It just drags and absolutely nothing happens. The climax is a big anti-climax and was a huge letdown back when this came out.
New Spring - I enjoyed this a lot. The part that was added to the novel version was much better than everything else. Very glad I got this.
Book 11 - I had only read this once years ago when it first came out. I really remembered nothing about it, but I had low expectations since this is where I vowed to wait for the series to end. On this read through I actually enjoyed this quite a bit. I felt this was on par with book 9.
Books 12 - 14 - I was very pleased with this. It did feel different from the Jordan books, but things are basically flying by here. I would gather the pace would have been quick for Jordan as well, since he had planned for book 12 to be the final book. Thumbs way up for the job Sanderson did.
I really enjoyed the ending overall. I wouldn't call it perfect, but so many of these types of series end poorly, and overall this one was very well done.
(some spoilery rambles)
This was an often frustrating series at times but I ended up really enjoying this read through, and would feel much better about recommending it to someone than I would have been before reading these last 3 books. Thumbs way up.