Legendary items are not unique though
And that was part of the problem, IMO, considering that was almost everything you had to hunt for. Nothing wrong with them being customizable in itself (that was fun, actually), but only if you couple that with a fair amount of more rare and unique loot, on top of that.
And the uniques are hardly any different from the one in D2
There were far FAR less of them on release. Just a few, really, and they were only attainable later on in Tier 3-4 difficulty. Not sure how it is today.