I was going to recommend Borderlands (t's not strickly an RPG, but if you're looking for lots of combat with loot in an open-world with little story, it fits the bill) but you say you hate randomized loot systems and Borderlands is festooned with that.
Some of the modern Far Cry games (3,4,5) are pretty good for having plenty of combat in an open world with not loads of random loot.
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