If system sounds fishy or offer to good to be true claims, most likely will be a farse. Math professors, math genius, secret systems, secret loop holes. All of these have been used by systems trying to fool people.
Seriously from what I can tell you very few of these systems are for real. Yes there are a few that are good sensible systems. You can tell these types of systems apart from the stupid systems by looking at what they claim and who is said to have created the system.
No system is going to give you really high win rates. So systems that claim logical more sensible win rates are your more legitimate systems.