I didn't know they did Brain Donors. It wasn't funny, but it was very Marx Brothers. Probably why it wasn't very funny.
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The part about the Marx Brothers not being funny that is, I agree about Brain Donors. That movie was a stinker. Except that the Farrelly Brothers had nothing to do with Brain Donors. It was the Zuckers and Pat Proft that were responsible for that train wreck.
As far as the Marx Brothers go, I would put Duck Soup up there with any other comedy you can name as far as being one of the most funniest movies ever. Their other output is very hit and miss.