I am a little puzzled by your numbers, actually. I just tested Facebook in MicroB and it took 43 seconds from hitting the Login button to the completion of my home page. I wonder why it is faster for me?
I agree fully with your overall point that the current tablets aren't really for your "normal," average user. I just thought some of your particular points weren't really fair.
I seriously hope that will change with the new device. All indications are that it will.