I'm told that's actually how gacha games are, especially from Japan, and the ones I've been playing are the exceptions.
Pretty much, yeah. There are some exceptions, like Another Eden being more or less like an old-school 2D JRPG and I wouldn't be surprised if there are a couple more like that, but most gachas I'd say are primarily menu/stage based (and yeah, those typically don't do much for me either).
Hoyoverse basically came in and flipped the market on its head by making big budget gachas with actual traversable worlds that blur the line between mobile/console/PC.
The "next generation" of gacha games is following suit, but really only from China with stuff like Wuthering Waves, Arknights Endfield, etc. Japan is lagging massively behind.
As for the games you asked about:
As Line said,
Nikke is basically a glorified idle game. I played it a bit on launch but the client didn't feel great and it somehow had too much busywork for me despite there not being much gameplay. The story seemed promising, and people say it's been really good, but can't comment on that. Music is great. It's also
really, really horny.
Punishing Gray Raven had very fun combat but it got way too repetitive for me. Dunno if it's different now, but their first event had a bunch of stages with story and after you completed that you grind the same stage over and over again multiple times for the entire duration of the event, because it's just the most efficient use of Stamina. Bleh. And yeah, the various weekly modes. Story wasn't anything to write home about up until where I played it. Great music though.
Honkai Impact 3rd is... interesting in that it feels like multiple different games duct-taped together. It very much starts out with that typical stage- and menu-based "classic" mobile format, but you can see how Hoyo has already been trying to move it towards something closer to Genshin/Star Rail over the years, with some story chapters later down the line getting fully realized traversable areas with side quests and puzzles and all that. And Part 2 is moving even further into that direction.
Storywise it's... uneven? Again you can really see the evolution where it starts out fairly lightweight and unremarkable in terms of story, but they eventually start taking it a lot more seriously. Even then, not everything is good and it has a tendency to ramble about it's pseudo-science concepts, but the highs are
really high.
One nice thing about it is that you can completely ignore the gacha and basically treat it as a regular action-RPG, since after the first few "tutorial" chapters, they very quickly only let you play as predefined characters for the story, with some chapters having their own in-chapter progression systems for whatever characters you play as at the time.
Your own characters are really only relevent for all the various weekly sidemodes, from which you get most of your currency income. But since you don't need characters to play the story, you can just ignore that if you're just in for that and don't care that you won't be getting new characters much.
Even so, it's a massive time committment at this point. I have no concrete numbers, but just playing through all the current story stuff is easily 100-200+ hours, probably even 200 at minimum.
I'm not entirely sure yet how things are gonna work with Part 2. You definitely don't need to play through all of Part 1 to start it (maybe some? I don't know), but I know everyone gets one of the new characters at max level fully geared for free, so I have a no idea how progression is going to look like for a new player. I also don't know how the weekly modes and all that will work. I think it's out in China already and global will get it on the 29th, but I'm not that tuned in on all the ongoings with that game, since I don't play it daily like Genshin or Star Rail.