The original OKCupid was the best dating site and the only one that I enjoyed using. It has since been gobbled up by the Match.com behemoth and is now basically useless.
Amen to that. OKC back in the day was wonderful, for nerds like myself who loved answering questions and data in general.
The great thing was that it was self-selecting -- the less compatible types answered very few questions and stumbled over anything involving basic general knowledge, logic or ethics. The compatible ones added thoughtful or witty freeform comments to their answers. You could essentially clear all the usual first-few-dates compatibility dances just by running through people's answers.
I met many wonderful people via that site, and I never went on a bad date with OKC; we always had heaps to talk about. I thankfully found my perfect match for all time via OKC nine years ago, just before match.com ripped up the matching algorithm and the questions and destroyed the site entirely.
It is not a good business model to match people well, and match.com clearly knows that.
Match Group also knows that buying sites that match people well is good business because there's so much room to juice the profits by applying the lessons from their other sites to them, and the valuations will be relatively low relative to user numbers...
Owned by Match? Yes, along with Hinge, Meetic, Tinder, and several smaller ones. The only big player outside of Match is Bumble (which also owns Badoo).
Of the two, Bumble seems to be the slightly less evil one (fun tidbit: Bumble at least used to value a lifetime premium subscription at roughly the same amount as 6 individual months subscription, which tells us something about the expected lifetime value of their users...), but their both of course profiting wildly of exploitative practices.
[edit] mixed up Plenty of Fish with OKCupid