Explorer is very slow and buggy in the Beta2 build
I wiped it from my Inspiron 6000 last week because I couldnt take it anymore.
Everything worked except for the headphone jack however.
The new control panel will drive you nuts in general, networking is now a chore. IMHO MAC OS X covers up your controls less, and is easier to use(controls wise), I don't know how to elevate my status via command line, making almost all of the administrative command line tools useless because of this.
Aero Glass is ugly, I expected more from its rediculous requirements, there is also little control over it, it either is on, or is off, by itself. The diagnal line shapes... umm that was a good idea, except it wasn't. Hopefully there will be a way to replace/change DWM arround more. You can't make windows transparent, the "cool button" start-tab nearly crashed DWM everytime I tried to use it, windows has a tendency to dump the UI if things go wrong, and then not restart it.(sounds good in theory but this isn't a server OS, and should save the applications state and restart if it can't recover)
Couldn't mount a Windows XP network printer(access denied?), couldn't print from a local printer I installed even though the built in drivers installed(?)...
I realize this is a beta OS, but there are a number of flaws that can't be fixed because they are part of the new OS design philosphy. BTW having 30+ icons in your control panel in classic mode(non-babied) is retarted. If this is the release to make system admin's lifes easier im not seeing it... seems like there will be more support calls from confused users as well.