I have written a good deal about my novice refit of my 32-200 for the past 2 years here on the forum and at
www.sailboatrefit.com. The Don Casey book "Inspecting the Aging Sailboat" is a good general reference.
Design-wise, I would offer that in the 32-200 there is very little space between the propeller stuffing box and the coupling, which makes changing the packing material "joyful." Take a look at the stuffing box or shaft seal.
The aftmost trapezoidal windows in the main salon experience some flexing (I think) and are located at a point of curvature and therefore are prone to leaking.
The 32-200 has a longer waterline and larger rudder than the 32-3 and the deck molds were updated and improved with better winch mount locations and some subtleties with how the anchor locker lid closes. The 32-3 and 200 are otherwise very close siblings.
Of all the generations of Ericson 32's the layout of the 200 is closest to what one would expect from modern designs with the aft double cabin and head. I don't want to come out and say it's the best sailboat that Ericson ever made, but one could be forgiven for coming to that conclusion.