The series doesn't pick up until 5? Or Mat being garbage? The first I don't really agree with. Egwene's experience in the second chills and the battle was really great. The third grants Rand his title and

spoiler

Tells Rand who he really is and he starts to embrace it. And sets up his people.

Things do ramp up starting with 5, but I wouldnt say it "picks up". For the second part, I do agree. Mat is kinda a little bitch, but in 5 he does have an experience that is an awakening or turning point for him.

Edit: "ramp up" and "pick up" are the same thing... I guess what im saying is I dont think it is slow by any means. At least not at that point. 8-10 is kinda going slowly, but it is cool with me because I have become so invested in the characters.