What's your problem with 9? Elayne's story is a tough read, if I recall, but most of the rest of the book I found to be some of his best in the series. 8 was neither good nor bad to me, just a moving along book with a slap you in the face epilogue (I think, hard to keep it all straight).
Well, it's been a long time since I've read it, so giving a full critique would be difficult, but going from what I remember, I found the first half of the book to be a slog. Then THE Big Event (being vague to avoid spoiling for other readers here) seemingly comes out of nowhere as if Robert Jordan just decided that the book needed a big climax so WHAM, there it is. I know Rand had been dropping hints for a while, but it still seemed a bit out of left field. Also, his story line in Far Madding seemed... very contrived or, more specifically, Far Madding itself felt very contrived. I honestly don't remember any specifics from Elayne's storyline but books 8, 9 and 10 tend to run together for me, except where Rand was involved.
Now, don't get me wrong, I don't think Winter's Heart was terrible or anything, but considering what happened in the book and what had been set up in Path of Daggers it all felt very, very disappointing at the time.
As for Path of Daggers, at the time I gave that book a lot of leeway mostly for two reasons:
1) It was the first book that felt like set-up
2) It was pretty action packed
My opinions may very well change, actually I'm sure they will, but those were my feelings at the time... ten years ago.