Yeah I don't understand why so many people complain of the Xindi arc. When I watched that season for the first time I was glued to the TV watching episode after episode wondering what was going to happen next.
I have a brother that makes fun of the fact Tucker and T'Pol got together. I found it awesome myself, and interesting because of the polar opposites they were. And the friendship at the end that her and Archer have.
I love the Archer/T'Pol friendship. In a way I think their friendship is deeper than Trip/T'Pol's romance.
I found the Xindi arc gripping on first watch, but now I feel it drags a bit. Still good though. OTOH, I've found my appreciation for the high points of the first two seasons has risen.