Updated 2.2 through MSU, used for 1 days now. Battery seems to drain alot faster than 2.1.
One thing to note is the operating speed, maybe is faster than 2.1, but passively it feels otherwise.

It's somehow slower and less consistance, from my findings it's due to the new animation system.
In 2.1, when you press an app icon from drawer or homescreen, it immediately starts the animation, which expand/zoom at the same time the application loads . If an app needs longer time to load, the screen will be zoomed in, blank with title bar, then maybe for few seconds the application will be loaded, which is fine, at least user will get somekind of feedback.
In new 2.2, when you do the same thing, the app will be loaded first, then only the animation will start(screen expend/zoom in), together with complete loaded app GUI. So, imagine this, when an app needs 5 seconds to load up, then after you pressed on an icon its like system just paused and unresponsive, until the app is ready to open...

which i belive lead to slow load time and slugishness that many users felt...
Really Hope Moto will update at least one more time to addressing above issues...