Hmm, I may consider the 360 controller as my new PC gamepad. I love my Logitech RumblePad (basically a clone of the PS2 gamepad) but I'm noticing a lot more support from games for the 360 controller i.e. Gears of War will not run properly with anything but the 360 pad (at least not with any of my gamepads).
I like my 360 gamepad on my PC. It is pretty good, I think.
A lot of people ain't fond of the D-pad. Though, I never really used it much for movement, anyways -- for movement. I usually use the analog stick above to the left of it; it's much smoother for movement, if you ask me.
I try to put the D-pad for other game options, like switching b/t equipping weapons, next/previous items, opening maps up, inventory, and that kind of junk. Works fine for that.