It's not very difficult to create an ui which is faster, easier to use and has more options to customize than tf3d. Whats cool about tf3d - the wather app? I'am wondering, what kind of benefit people see in this peace of software.
I am using MS2 and it beats tf3d in all regards. You can get with a few clicks to anywhere. If there is a menu you miss, you create it, or you delete an existing one. You can use the complete MS2 only with your thumb. (hardware+softkeys). You have shortcuts to your last used programs within the today-screen - if you wan't to keep a shortcut, it's possible to stick them.
MS2 throws you not so early back to WM6 as tf3d. (contacts,notes...) I even find it is optical more apealing on the long run and more unified in look and feel.
That there are many ui's better than tf3d is more because of the bad design of it than good design from the others, I have the impression, the makers of tf3d are only interested in smashing some eye-catchers together for nice screen-shots, instead of getting the user fast and easy to the point where he wants to.