Online dating is mostly full of women who like to BS and time-waste in my experience. Lots of girls will send you a few messages and then ghost.
You can even get their numbers, arrange a date, and then they'll ghost. Lots of guys on here like to say stuff like "That's 'cos she found sum1 moar alpha LOL!!!" but the simple fact of the matter is a good 60-70% of girls on free dating sites aren't even looking to date (maybe with the exception of if they see a guy they 100% can't resist but that relies on you being exactly their type).
I know really hot girls in RL that have been on Tinder/PoF/OKC for over a year and have done nothing but whinge that they haven't been on a date for 2 years. They just go on these sites, browse, chat s**t and string guys along because it gives them a nice big ego mast*rbatory session. They just like knowing that they have loads of guys chasing them and messaging them. It's the same ego-trip they exert when collecting orbiters.
The biggest focus is on your photos, so they need to be borderline-unrealistically good. Apparently even male models get a ~4% match rate on Tinder and that's considered "excellent". Which to me is BS - in all honesty you're better off taking up a hobby where you'll meet new people, learn some sort of skill (martial arts, dancing, music etc.) and meet some hot chix. If there aren't hot girls there, befriend the girls you don't fancy and party with them. They'll almost certainly have friends you'll find attractive.
Online dating honestly knocks 6-7 points of attraction off a guy. Girls who would be begging to date you in RL will regard you as a 3/10, and 20 stone 5"5' girls will consider you an equal. It's ridiculous.