Yes! It was very successful for me.
Whom you meet is more important than how you meet.
The same people who are online also go to the grocery store, mall, parks, nightclubs, gym, restaurants, theatre, church, school, or wherever people often meet "offline". Online dating is nothing more than a (tool) or another "option" for meeting people.
Much like a fork that be used to eat a garden salad or a slice of double fudge chocolate cake. However an obese person would never blame their weight gain on their fork!
Nevertheless people that have a bad online dating experience tend to blame "the online dating industry"
Each of us (chooses) our own friends, lovers, and spouse.
Naturally it pays to research sites before joining them. They're not all equal. I personally advise against joining a "free site". It's like trying to compare a night's stay in a Motel 6 versus a night at The Ritz Carlton. You have to know what type of person (you want to meet) and put yourself in their shoes when asking what type of online site he/she would likely join. Today there are also lots of "niche online dating" sites that cater to various age groups, religions, race, pet owners, single parents, political affiliation and so on.
Always use good commonsense when dealing with strangers whether online or offline. In the end (you) are responsible for choices (you) make. A lot of "good people" get placed in the "friend zone".