@Dexter Morgan, what's so wrong with roofs and circles? I guess that's what you hated about the ones you posted (all of which I found appealing, by the way). And I'm guessing it's because they go against the American tradition of "no roofs for football" and "triangle stands for baseball". If that's the reason, then it's a matter of tradition, and that's the same reason why Europeans love square, roofed, multi-tiered grounds (I loved that "Color Line" Norwegian stadium, by the way; only bad thing are the supporting columns).
Here's a recently demolished one that was hideous, the Doble Visera belonging to CA Independiente, Argentina:
Note that in Latin America most clubs are happy just to have a stadium and don't focus in design unless it's really necessary (either it's too small or it's too ugly).
Regards.