I have done the same mistake as you
I bought the HD7 with WP7 on it, but without read any information about the new os before.
I was very disappointed, about this minimal os and no or a few administrator functions, as i realized that. And i dont believe that Microsoft leave their new politic line in future, that other developer could write some system tools we need.
Before i used a HTC Blackstone with installed MN6.5 and i ve thought that WP7 was only new released to make it faster and with some new functions or updates, so as the new OS for PC Windows7.
But they deliver a "dumb user device"
No Explorer, no other Browser possible, no static ip, not much setting options, and so on, and so on.
For me an useless PocketPC!! Its a Multimedia Player with an integrated Telephone.
The Hardware from HTC is very nice, but i hope now for an imminent Jailbreak to use more soft, or a possibility to update the rom with old WindowsMobile6.5.
I wrote my opinion to the german Microsoft Support Forum too, that they have a negative feedback from an advanced user.
You all should do it too, that they notice the Dissatisfied!!!