Not surprising considering they are endorsed by the biggest stars and Adidas' marketing is a hit or miss. They have the biggest big-man in the game right now and do you hear about his shoes? DRose is their only hope and that is pretty much it while Nike has so many stars that they can't even give a quarter of them their own signature shoes.
As for bball shoe design, nothing really gets me hyped anymore after Jordan XXI. Most sig shoes these days doesn't do it for me, they look huge and bulky and way too busy. Lebrons sig shoe is becoming bigger and uglier. I much prefer Nikes Team shoes like the HyperDunk or HyperEnforcer.
Kobes sig line is nice and all and I like it that it is low cut but they are trying to cram too much shit into it.
I just want a shoe like the BB1 or BB2 (two of Nikes best that they never continued because it's too simple), a shoe that has full zoom air that performs very well. Comfort, grip and fit is spot on. My favorite on the court is still Jordan XIVs, to me nothing could replace that, just a great all around basketball shoe.