Yes, it was an approved ED treatment in Europe but I wouldn't call the results 'poor' and here's why.
Having the right treatment is not enough, you must use it properly. I'm convinced that most users of Uprima didn't know how to take it and swallowed the tablets. You don't swallow these tablets, you have to keep them under the tongue until they dissolve.
Finally, apomorphine is a centrally acting drug that improves dopamine levels in the brain. This makes it perfect for cases of psychogenic ED or sexual performance anxiety but it's probably not the best option for vasculogenic ED (unless you take it in combination with other drugs).
I am sure that the patients knew that the pill should be kept under the tongue. I don't know how much it was used as a combo with other treatments. But the fact is that it is not available anymore and nobody wants it back. I have never seen any positive feedback of it.