their big contribution is that they have passed the 'it just works' threshold for the common desktop.
I've been using linux since 1994, it's been my desktop since 1997, so I'm not someone who isn't familiar with linux and desktop support. But I recommend Ubuntu for people new to linux, or for people who don't want to maintain their own system (including for family and friends who I provide the support for)
this is the first change I have noticed in the distro to make money. They offer paid support (every linux disto vendor does), and they don't give away the source to tools that run only on their servers. that's also very common.
that's not reason to be as hostile as you seem to be.
now if you really want to get into a distro pissing match, I could start in about all the certified redhat experts who can't admin their way out of a paper bag ;-) but I know that every distro will accumulate bad users along with good users and try very hard to recognise that the vocal group are seldom the majority.