The people who claim that Diablo 2 had such a big build diversity and such amazing items forget that 99% of the Diablo 2 guides also were about the same 2-3 items. Diversity wasnt as big as you guys think.
Also, the game D2 was much easier in general. Of course you can have more builds when you can just steamroll mobs with any item combination as soon as you reached a certain power level. The endless scaling actually adds challenge and replayability to D3.