So often the story in agriculture is 'be careful what you wish for..' Corn that resists glysophate seems to breed weeds that do, too...
When I gardened in NJ long ago, a multiflora volunteer was climbing a maple tree and it was the only rose in bloom. For a very brief moment I considered it one of the best roses in the garden. It was certainly the one that required the least care. And I was fond of its great panicles of flowers. I even found some subtle beauty in the golden stamens within the flower. I think the color scheme found its way into RoseFile. I think if it had been as fragrant as the musk rose, I would have been delighted with it.
If you are worried that it will crowd the cows out of your yard, I think you should get rid of it post-haste. But if you like it, definitely give it another year.
