About the diversity of the items in LOL
Items in Lol are too much _GOLD _and SLOT efficient - builds in the game are sterile, because it's a waste not to buy the standard ADC (IE, PD, LW, BT) or AP build (mana regen/Ludens/Rabadon/Void/Zhonya) - if you don't buy these items, your dmg will be crap, unless you have %HP or _true _dmg abilities. Hybrid and Triforce builds fall off super fast, because of the lack of hybrid pen - you deal no dmg against people with any defense. Crit and AP scalings are too strong too compared to the HP pools of the champions later in the game. "Sustained" dmg dealers 2-3 shot anyone who walks near them; burst casters can delete the whole enemy team with 1 full rotation and enough AP.