But the other day, after having bought a new computer, I did give a go to this beta Unity.
It's definitively not my taste, BUT I can see why this was made. It's clearly simpler than anything I've tried before on Linux. The "start key" open a sort of menu, type to search apps, all in the bar make sense, I'm not fond of the global menu, but well, people seems to like it.
We have to keep in mind that it's just the first release, and it'll evolve in the future, but after having tried it I went from a complete hater to a "well ok, it has it's place".
After 2 days I moved back to my simple and light openbox/tint2 combo, but well, this is only because I'm not the target market for Unity. Unity is for people not for hackers.