It's just another tool for meeting new people.
Much like a fork is tool for eating. It comes down to choices. One can eat a garden salad or a slice of double fudge cake.
However an obese person never blames their (fork) for their weight gain! And yet people who have bad online dating experiences will blame the online dating industry!
Each of us (chooses) our own friends, lovers, and spouse.
If anyone is having one bad dating experience after another they probably need to re-examine their "mate selection criteria".
It's not (where) you meet but (whom) you meet that counts! Ultimately (you) are responsible for whom (you choose) to engage with!
I've had some long-term relationships lasting over 7 years or more with women I met online. However I believe one should view online dating as nothing more than another option to meet people in (addition to) offline methods. I'd suggest avoiding the "free sites". Whenever something "free" you're likely to have to weed through a lot
A lot of people give no thought to researching online dating sites before joining one. They foolishly believe they're all about the same. That's like saying staying in a Motel 6 and a Ritz Carlton Hotel are the same because they both have beds and cable TV.
At the very least you should visit datingadvice.com and check out their reviews of various online dating sites. They have reports that break down the demographic with regard to age and gender on the various sites.
You also might want to look into "niche online dating sites" if there is a specific "must have" you require. There are sites that cater to particular age groups, races, religions, political party affiliation, pet owners, sexual orientation and so on.
Lastly you might want to join one or more hobby groups listed on Meetup.com in your area. Meetup.com has groups for just about everything you can imagine: wine tasting, book clubs, single mixers, dancing, yoga, meditation, theatre goers....etc Groups meet once or twice a month. If there are any singles in the group you can gradually get to know them over time without any of the dating pressures. The worst case is you get out of the house make some new friends who may or may not know some singles.
You may want to also read a hub I wrote awhile back titled.
"6 Common Mistakes Women Make With Online Dating"