It's one day after the big launch and judging from the new posts/complaints on this forum (and think of how many people don't even know about these forums) - there are a lot of problems. From those few posts I've read, I think many of these problems are self inflicted.
Regardless, there are going to be endless calls, tweets, postings, and articles written on how crappy Windows 10 is. I'm sure a lot of people at Microsoft put a lot of effort into Win10. - I'm feeling sorry for them.
I think this is going to be messy.