I met two interesting men through eharmony. So it can work.
But I have no patience with the system. I want to do MY OWN looking, I want to be free to contact whomever I deem interesting. The matching is ridiculous!! I LOATHE prefabricated questions and having to sit and wait for my matches to reply. YAWN!
IMHO, eharmony is great for people new to and scared of on-line dating. Not for me.