What state is Diana in?

So she's in a really bad unplayable state? Not even if I practice a lot and get super good at her?

She's in one of the worst states any champion in the game is, but she's playable... if you like handicapping yourself. I spammed almost nothing but Diana to Gold last season and to mid/high Gold MMR this season before giving up on her. There comes a point where you can't just use any champion regardless of how nerfed it is and not handicap yourself while you're at it.

It's infuriating playing her late game as she is knowing regardless of what you do, regardless of what your build is, you're super easy to counter and insta-gib. It's infuriating having to put in so much effort at any point in the game to get minimal rewards compared to any other champion. It's extremely frustrating being 2 levels and a full item up on an opponent and knowing you're too nerfed to assassinate him when almost any champion can do that if they're that far up and even a semi-carry.

These aren't my feelings alone, I added the few high Elo Diana mains I could find to ask them about her. They all feel the same, that she's relatively unviable and a handicap.

And I see some others here are making a comparison to Akali, there are so many differences I don't even want to talk about it. Akali is not only viable but she's strong meanwhile Diana has low base damage, low scaling damage, a passive designed to cripple any Attack Speed you build (% added to make the base a joke), and has absolutely no method of escape despite being an melee champion.

Take from the guy that had nearly 300 games with her last season when she was considered trash before she was nerfed more (itemization + ninja nerf)... she's one of the most harshly gutted champions in the game to the point that I gave up. Her season 4 "buff" was a nerf because it was a response to itemization nerfs and overall a solid chunk of power lost in any type of trade. The longer the exchange the more damage lost and it's a large chunk lost even in an instant exchange (30% AP). The ninja nerf to her passive's mechanics (R being a stack for her passive) really ruined the ability to ever use her passive in lane. The opponent would have to be retarded to get hit by it now.

Just remember win rates are bullshit without context. Diana is one of those champions almost solely played by mains, her win rate is extremely inflated in comparison to normally played champions. So you may see it at 40-whatever % and think it's fine when in fact it'd be 15% lower if it was played as regularly as strong champions are. That and the higher the Elo goes the lower her win rate is even while being artificially inflated, low 40s typically in Diamond.

So she's in a really bad unplayable state? Not even if I practice a lot and get super good at her?

She is playable, any champion is playable (remember that poppy pick in tournament? She carried) It all depends on how you play her. Diana is just a very item dependent champion and she got nerfed pretty hard but if you position yourself correctly and roam (like an assassin should) you can do well with her. Yeah there are other champs that can do everything Diana can and even better but that doesn't mean she is in an unplayable state. After her nerfs she was made into a champion that requires perfect positioning and timing and if you mess up you get punished really hard (compared to other champs) since she doesn't really have a form of escape. I still main Diana as a jungler and sometimes I tend to do well with her (not all the time) but she is still one of my favorite champions. I climbed to Plat as Diana Jungle only and had a fair success rate with her. Any champion is viable, it just depends on the player and how committed they are on playing the champion.

Yeah, I enjoy doing that. Or jungle. Madstone diana is still hella fun.

None of them are really viable in ranked though, unfortunately.

As she is now she counters Katarina because she can pull her out of her ult. That's it. Everything else you listed is dumb rumours by negative Elo players or is no longer true because this isn't Season 2, it's almost Season 5. She used to counter Fizz when her stats were high enough to to stop him from assassinating her and actually do a lot of damage back to him, that hasn't been the case in a long time. People are so used to getting free trades with Fizz, doing damage and escaping without taking any, that when they attack Diana and take damage from Pale Cascade it's suddenly a counter in their minds even though they win the trade.

She's still playable and has the same issue like akali (but akali is manaless and can spam ult on longer range with higher burst) if she gets fed she can be a monster if she doesn't get fed she is pretty much a liability to the team. She has too many counters in lane and jungle so you gotta play it safe, she is still strong but not the safest pick.

Who counters her? According to championselect, she counters most of the meta; She counters solo queue stomps like Akali, Kat, and Fizz, and even competitive meta picks like Orianna or Ahri, while going even with people like Zed. Who counters her?

She technically did back then but with the nerfs she took, it takes a lot of skill to counter someone, Diana is just a champion u do well with or not