Unity in 11.04 is a different beast than the thing in 10.10 netbook. Unity11.04 is rewritten as a Compiz plugin for performance reasons. Unity10.10 was based on Mutter/Clutter and suffered poor performance b/c of that (among other reasons).
Anyone who used Unity in 10.10 should give 11.04 a new and fair shot since they are 100% different things.
The only issue with that is if you don't have a spiffy OpenGL video card. Mutter and Clutter have come a very long way since the decision not to use them.
ahh thats where unity 2d comes in :) a brilliant move to include those who gnome shell said "too bad" too. expect to see more of qt in future ubuntu ui improvements
One real plus in 11.04, is the installer. Really convenient.