Common issues include dishonest profiles and scammers.

Some also complain about sites inflating subscriber numbers, making people who sign up think they'll have plenty of choices, when most of the users are actually inactive.

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Members can evaluate potential dates by reading their profiles, which typically include several photos and a statement about what that person is looking for in a mate.

Some of these sites also suggest other users based on profile information.

The big names, including Match.com, e and Ok Cupid.com, have retained their popularity and lodged modest growth.

However, users -- particularly younger ones -- including the most popular, Tinder.

Plenty of people have met and married because of online dating -- 29 percent of people know someone who met their spouse or a long-term partner this way, according to Pew -- but others report frustration and disappointment with the experience.

Negative user reviews of online dating sites far outweigh positive ones.

The site's long, detailed compatibility test serves two important purposes: It helps users go beyond looks to find someone well matched for their personality, and it makes the site less appealing for scammers or anyone just looking for a fling.

Reviewers also say the site is attractive and easy to navigate.

Ok also shows you when a potential match last logged on, helping distinguish between active and inactive users.

has carved out a reputation as the best online dating site for marriage-minded singles to find their true match, and reviewers say it's well-deserved.

Singles tired of swiping through endless photos may appreciate the simplicity of Coffee Meets Bagel, which delivers just one match, or "bagel," each day.