I think a lot of people here are missing that Legendaries =/= Uniques. Some people are complaining that they're not unique enough, but that's just it. They're just rares with a tailored super-power. Uniques are in fact unique and have pre-set stats and some of them ACTUALLY have unique abilities that define/make builds in this game. They're just super rare and you won't see them until WT3+ and realistically not often, if you can even say that, until WT4.
The item system is uninspired, but it's akin to basically every other ARPG there is. People love Last Epoch's crafting and items but that shit is painful with their offensive prefix, defensive suffix stuff and their build-a-bear crafting system. PoE's strength is also its weakness in just massive RNG on RNG with different influences and tiers and a million affixes and you're just hoping to hit something good or something you can work with within the confines of their crafting system. But when you get lucky, it feels great. Feels like you won the lottery. However, like the real lottery you're losing millions more than you're winning if you're just ID scrolling.
D3 Legendaries went from being AMAZING (Shard of Hate, TFury, Cindercoat, etc) to GOOD to okay to okay+ if primal. The reason being that the set system fucked power up majorly. Some of these items had like 200% weapon damage procs which felt great for the first 2-3 seasons, but then you got set bonuses that literally have 1500% modifiers or worse and there's no way a dinky 2x hit is going to even be noticeable compared to some set bonus or some big 700% multiplier on your main skill. That's the exact reason they shied away from sets and wanted to focus on Uniques for main power. So when you find that very rare item it potentially means a new means of pay opens up and you can FEEL the power from it. I think for at least half the Uniques that seems to be the case. I've just been a Necro so I can't speak for other classes except I know there's some helmet like 100% of druid builds use as well so I imagine it's similar for them.
AND AGAIN
If you loved D2, don't like this or feel meh about it, like PoE but hate a lot of it's systems:
Project Diablo 2. It's amazing. Honestly the only game I'd consider being close to rival PoE in my personal opinion. It's classic D2 items, with PoE maps, with constantly update runewords/Skill changes, with Corruption shards for slamming items. They just released a 60fps version and it is VERY fun. Definitely more fun on a league launch, which should be a month or two away, but it is a VERY fun version of D2. If Blizzard was smart they'd let them use D2R assets to get more D2R box sales and then it would absolutely be the closest contender to PoE for top ARPG.