I don't know about the ratios (or how a user looking through could really tell what the true ratio is) but as far as none of them having a decent matching algorithm... I'm a big fan of OkCupid here... (I know they were aquired by match but they still operate independently AFAIK) I interviewed for them 12-13 years ago but never worked there, but they were Harvard math guys who founded SparkNotes and "opensouced" an early version of their basic matching algorithm in 2004 or 2005 on their blog, I'll see if I can find and post here or perhaps someone else will share bit the gist was only using the intersection of questions you both answered, and both of you don't just answer the question but also give how much you care about the answer to this question and "acceptable" answers from your match (if you care at all, if not answers don't matter) and they use those to customize weight of each question in matching... I don't know if it has any special romantic matching qualities but it's WAY better than anything else I've tried for a metric of people worth meeting and who you'll sometimes have INCREDIBLE amount in common with, when match percentage is over 90 or 95%... I've dated two 96+% matches for over a year FWIW.

EDIT: couldn't find original blog post but this article seems to have some of the same math/details in less entertaining form https://blogs.ams.org/mathgradblog/2016/06/08/okcupid-math-o...