I'm guessing no one has played Tanto Cuore (myself included). I am genuinely curious as to how good that game is, because it looks to me like one of the most blatant rip-offs of Dominion, mainly just adding Anime style Maids as the theme. It seems to keep most of the vanilla resources of Dominion.
I've played it, and I think it's a decent game - questionable theme and art aside. It's probably the closest thing out there to an actual Dominion clone (not counting the official Touhou Dominion release that literally just renamed cards) - it's probably the one Donald often refers to when he talks about clones where the main innovation is apparently "make the Treasures cost $1 more". While it's one of the first things you might notice, the game does also have:
1. "Private chambers" that act a little like the Tavern/Island mats (some cards let you put them there, often ones that score points, although typically there's no way to retrieve them mid-game)
2. "Private maids" which is a pile of unique cards that usually give you a bonus at start of turn, but which you can only have one active at a time
3. Some interesting scoring cards - cards that are worth different values depending on whether you have an even or odd number of them, cards that score differently if you manage to chamber them (like Distant Lands), etc. Each expansion actually has a different set of basic point cards that score slightly differently, too, so it would be like if Hinterlands had replacement Estates and Provinces with different values.
4. The expansions add other new ideas, like a pile of cards that you have to meet certain conditions to claim.
Is TC a game as well-designed as Dominion? Probably not. I enjoy it, but it is very obviously a more "fluffy" game than Dominion in more ways than one. And there's definitely an essay or two you could write about the theme and art and the portrayal of women (and while some of the art is borderline pornographic, plenty of it is work-safe and downright cute). I'd also point out that it doesn't change a lot of the things that are causes for complaint when Dominion players play other games - it kept the one Action/one Buy rules (and has cards to let you do more of both), it has a fixed supply with only a few special piles that contain unique cards, it doesn't have much in the way of deck thinning (which relates to the more expensive base currency - if you could trash your deck you could potentially stalemate yourself) but it does have some means of replacing cards with better ones and/or taking cards out of your deck.