Well hey I really like pizza...buuut since you asked:

WM7 (HD7) downers:
No multi-tasking, results in lots of reloading…
No cut, copy, and paste
No custom ringtone capability
Limited customizability on Start screen
Lack of some key apps (Evernote, Kindle or Nook, and podcatcher)
Office apps are pretty limited in terms of what you can do from the phone
Inconsistency in auto rotation (especially lame with kickstand and then Zune always in portrait mode)
Lock into Zune software for PC connections (no drive or file access)
Lack of tethering support
Lack of ability to capture screenshots

Android goodies:
True multi-tasking where apps can be running at the same time as other apps
Customizability of the home screen and panels
Excellent application selection in the Android Market
Google services integration with Voice, Listen, Search, Gmail, and Maps
Full access to the directory structure on the device
Excellent Exchange integration with slick view options (conversation, faves, attachments)
Awesome mobile web browser with best text reflow support compared to ANY other platform
Google Maps Navigation service that is tough to beat and has proven to be reliable
WiFi Hotspot tethering capability
Widgets for things such as wireless connection management
Swype text entry keyboard

>Really? That's it?
>
>
>>The new Pizza Hut app! woohoo!
>>Android - check
>>iPhone - check
>>iPad - check
>>WM7 - of course not.