heres my opinion....
WP7 cant be reviewed AT ALL right now. nobody not even bill gates has used the final polished version. the only thing that anybody can really talk about right now is the ui, personally i dont like it. i prefer to have a home screen with a big clock and my appointments and then go into a menu to see something like that.
right now im using the droid and i love android, its faster and more stable than wm6.5 IMO. when wp7 comes out i will try it but for now im sticking with android android
remember no os is perfect and everyone is in titled to their own opinion.