I've tried FontSquirrel, WhatTheFont and FontSpring and they all suck.

What is an identifier that actually works?

They don't suck, it all depends on the quality of the pic you provide.
Garbage in, garbage out.

I disagree. try finding a script font. It doesn't work. They all want the letters to be separate then give you 20 samples that look nothing like it.

They "suck" because they do not have the font you are looking for in their database. In such a case, what they do is present you with the closest font that they have which may not even be close to what you are looking for. What fonts are on their database? Those are usually the fonts that are available for sale at their site which limits the apps identification capability. So if you are looking for numerous script fonts that had been appearing lately, you will have a better chance of finding what that font is here at Dafont than at MyFonts/WhatTheFont and FontSpring/FontSquirrel. There's no guarantee but you might have better luck at http://www.dafont.com/forum/?f=1 Find a good quality image, do not enlarge nor retouch, post it and hope for the best.

I've always used whatthefont and it has always worked fine for me...

What has served me very well is Find My Font, I don't know a better solution.

Try Font Moose on Luc Devroye's site:

http://fontmoose.devroye.org/cgi-bin/FontMoose.php

Luc is a Professor of Computer Science at McGill University in Montreal, Canada, and he probably knows more about fonts and typography than anyone else currently alive. He also hosts my homepage, which includes some of my early fonts that aren't on dafont.

One additional font that I made and released publicly is on fontspace(dot)com, (MockingjayXL - single glyph). dafont doesn't allow single glyph fonts, but there is one exception, (Obey Venice, part of the collection in my Obey Series 2:https://www.dafont.com/obey-series-2.font

Script fonts are hard to find exactly due to their various letters or opentype features. I usually combined all the tools, had a font manager to help but sometimes still wasted many days to find out.

I don't use software to identify fonts. I get better results from jerseygirl.

That's funny