I think it's a real good book. I just got it and am almost finished with it, the amount of talent they were able to produce is just amazing but unfortunately they were just never able to cross that last hurdle (the two division format really hurt them).
The mistakes that the Expos made have been detailed quite a bit on these forums but I think they did and still do have a passionate fan base. They were just the victims of circumstance and some bad moves by ownership, but if a team like the Rays moved to Montreal I think that they would do well there. I would also hope they could take the name "Expos" and would wear the uniforms they wore back in the 1970s.