Cut & Paste & the Marketplace fix(es) are coming in NoDo which will be released this next week (21st-25th). Youtube does stink, and I would bet they are working on making it better for a fairly soon release as thats a big one people use on their phones.
Facebook app stinks? The integration is best out there, and the app is pretty good for me. They had a fix for the facebook app crashes within 2 days.
I know its a bit rough coming from more "matured" platforms. I came from Android (and iPhone before that) and miss a ton of features, but when I go play with it I am quickly reminded how much better the wp7 structure & UI is. The platform will be great, but it does take a little time. You could always go back to the iPhone until later this year when Mango is released, and some nicer hardware (like maybe Nokias first releases).