I don't see what else they could have done with the Pro controller. After seeing so many developers screw up the Gamecube controller by making you press B+X or whatever, they knew they needed a controller that would allow for effortless porting (other than analog triggers), but they also needed a strong unique brand identity that even most moms would be able to tell the difference from the other two controllers. Putting both sticks on top was pretty much the only way to do both. As for the shape, it's to be expected. There are only two other first-party primary controllers out there right now -- one was specifically designed to fit in a hand, and the other is pretty much just a SNES controller with handles added. If another company makes a controller that's also specifically designed to fit in a hand, they're both based on human hands, so yeah, there's a good chance they'll be shaped similar.
I mean, what, were people expecting that star controller? (I am actually intrigued by that top-right controller. And the one on the left... does that have a taped-on piece of notebook paper for an A button?)