The "sausagefest syndrome" is inherently why so many online dating sites suck. Guys sign up and get barely any responses to their profiles or messages. Girls sign up and get immediately overwhelmed with messages, some interesting but the rest mostly boring or creepy. Guys get frustrated at the lack of traction and leave. Girls get overwhelmed by too much attention and leave. It doesn't help when the online dating sites start using fake profiles and pictures to give the false illusion it's not a sausagefest.
I've seen friends sign up for Match.com and be like, "this sucks, they have no matches for me," and then I find they're looking for half-Asian half-Russian college-educated non-smoking dog-owners in a 2.5 mile radius, or something like that. That's almost guaranteed to not work. Unfortunately the alternative is some sort of "shotgun strategy," which if done poorly, means sending a message to 50 girls with the same copy-pasted canned sentences, which only contributes to the women being overwhelmed. You still need to aim the shotgun. I effectively had a routine where I'd spend an evening looking through profiles, only ruling out absolute deal-breakers, and then sent a message that while mostly short, at least made some reference to the actual girl. Out of 20 messages I'd get like 5 responses, which would lead to 2 phone calls, and probably 1 actual date. Rinse, repeat.
Yeah, it's kind of annoying to fill out a profile and all that, but to me that's never been the problem. I feel there's a lot more social friction to get women to sign up for these sites, because while online dating to guys is basically, "well, why not, it's another possible way to meet girls," to girls it's, "this is admitting I am incompetent at/undeserving of finding love." Until that's overcome, online dating will always be a poor experience for a lot of people that try it.
How do you overcome it? In a drunken night with friends a couple months ago, I started rambling about an online dating site that embraced the male-female disparity, and basically would pair up something like 3-4 guys to every girl, and set up dates where you'd all go out like "The Bachelorette." There's a lot of reasons why that idea would be a hard sell, but if anyone ever does successfully do it, just make sure to give me my cut[0].