Of my three trips to the Cordillera Blanca, I have only heard of two attempts on Copa. I've always wanted to climb it as well as a warm-up, but those two trip reports -- one of which by my usual partner -- came back with the access to the glacier itself is a bit of nightmare (crumbling rock, steep and difficult to protect, even some steep water ice) with the glacial tongue being significantly more melted out than the pics in the guidebook. (So I was persuaded to climb other peaks, which was fine, because there are plenty of other peaks to climb.)
Once on the glacier itself, I was told, the climbing is straightforward, with the typical glacier stuff (crevasses). I can't speak for every year, but the three summers I was there it was not a coveted peak at all and there weren't crowds clamoring to climb it. It's a long, long snow slog once you get on the glacier, my partner said, and not very interesting. But I think it's a beautiful, striking peak, and one that I've always wanted to climb. Others just haven't shared my enthusiasm for the reasons I mentioned above.
That being said, might as well give it a shot, take some pics, and have a safe climb.