Which desktop environment? It comes with several. It all depends on the
user and their preferences. Personally I hate Cinnamon worse than Unity or
GNOME Shell. My order would be Unity, GS and Cinnamon, but someone else
might really like Cinnamon. It all comes down to what you expect and how
much s delivered. Going into 11.04 there were high expectations that were
dashed (no pun intended) and it has had a hard time gaining traction, but
Unity has more promise than either GS or Cinnamon and it is really making
gains and inroads. I have been using it for several days now (for like the
20th time) and it is working well and I am a KDE guy. I have it customised
to my liking and it is performing fine. I will go back to KDE, but see no
problem with Unity.