That actually is one thing that I agree with, but I don't tend to replay the campaign from a different race usually so didn't really bother me. But I know most people do that tho.
You seem to be very active here, big fan? :)
I liked the expansions too, but I just preferred the second one over the first.
My favorite would be the 2nd one too, and also because of the campaign! The 3rd one sucked balls, though.