As I've posted elsewhere: (I seem to be disagreeing with a large number of people).
Isn't it wonderful that we can all have such differing opinions on the same subject matter.
Personally I have loved just about everything about the WoT series. I didn't mind the 'slow down' too much in the mid books although I am not the greatest fan of political intrigue. To me a lot of the series is like a vast game of chess, the opening moves are quite exciting as they set theshape of the contest to come. The middle game is all about manouevering your pieces into the best position to gain the slightest of advantages for the coming end game whilst trying to deceive your opponent as to your true intentions. This slow movement prepares everything for the ending where you hope for a spectacular and 'bloody' (metaphorically) ending. I never at any stage put down any of the books in this series thinking "I don't want to continue" and I have now reread the series numerous times.
I can't say the same for aSoIaF. Halfway through the second book, I put it down for three months. I've now read a further couple of chapters but find this series much more of a struggle than any of the WoT books.
I've decided to read the "Malazan Book of the Fallen" series as this has been recommended elsewhere on this site.
I am determined to revisit aSoIaF when the series is concluded but apart from some individual stand out moments I find there is little of a story thread to this series. It is mainly one army marching on another, fighting a battle, one or more major / minor characters die. Repeat.
I find it extremely difficult to care about any of the characters and I never had that dificulty with WoT.
It can't just be that WoT was the first SF series I read. (I'm not counting the Narnia series which I truly do still love and reread if I only have a spare couple of days)! I'm sure you retain extra love for your first but that can't surely explain why my feelings for WoT appear to be much stronger than most people posting on this site?