I've tried like hell, I mean I've really tried, been trying to use Ubuntu, but it just keeps failing me. Like copy & paste isn't reliable! Something that should just work, just fails for me all too often.
I never have had a problem copying stuff in Nautilus or text editors in Ubuntu...the biggest problem I have dealt with is Nvidia drivers...but Ubuntu 13.10 runs very smooth on my laptop with nvidia drivers...Ubuntu is coming along pretty nice...
Copy and paste isn't reliable? I've been using it for a couple of years, never heard of that issue before.
Been doing that for 2-3 years now, and haven't been happier. :)
I do think Ubuntu and its ilk could improve their UI and make it a bit snazzier (like Elementary is doing), but you can use them as a primary OS now.