you know that mania skin is pretty much literally IIDX which is pretty widely loved iirc but shrug!!!
i wouldn't know cos i have never bothered learning osu!mania i get tired enough doing 180bpm 1/4
IIDX is cool, but that doesn't automatically make the skin good. Variable width columns are... well, pretty stuffty in general. I could see someone getting used to them, but eh. Doesn't seem very smart if you're wanting to play competitively.