In my opinion, those e-harmony sites do very little for people that are looking for a relationship, online.
I am a HUGE believer in online-dating, but I feel that half the reason why things work out for those that use it is because you have to wade through the stupid people and find the hidden gems. When someone just falls into your lap based on somebody else's work/effort, you take that person for granted and you just kinda run with it since a computer told you it was a good idea. I've seen friends waste tons of money on those services and not one of them has maintained a long-term relationship with the people they've met through e-harmony.
I used POF and Lavalife for 3 years and met a lot of women. Most were 1-date flops, but I met a few girls that lasted longer than that. I still met/dated girls from the real world (gym, Starbucks, clubs/bars) but the majority of the girls I dated were from the internet. When you meet someone from an online dating site, you can go into more details than just their appearance, assuming they know how to put together a decent profile.
*Sorry guys, if you ever claim you approach a woman in a bar because of anything other than her looks, that's straight up BS (unless she's reading The Art of War in a bar, which is neat, but effin' weird)
I met my wife almost 6 years ago on Lavalife, and I couldn't be happier. I had to wade through a bunch of duds to find a good one (albeit her that messaged me) and I appreciated her when I met her, and I still appreciate her, today. We had very little in common when we met, but we've grown together and have found many commonalities over time. Without internet dating sites, I wouldn't have met my wife and I wouldn't have my daughter... so I owe everything to internet dating
My two cents.