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I don't think it is particularly helpful to to discuss actions of Martin Robinson or IAOPA in the past nor the advantages and disadvantages of joining IAOPA. I'm an AOPA member myself, and I see clear benefits to me.
I started this debate because Mr Robinson / IAOPA communicated to me on the current negotiations. I think it is not unreasonable to ask for a cost & effort conscious simplification of private aviation regulation in Europe. Some of the points mentioned in his communication seemingly contradict this rather straightforward view.
Replacing examinations with currency requirements for the instrument rating is an obvious one. Honouring ICAO papers another one.