I used to work in the law dept at Corporate. They get a good amount of employee-related lawsuits. They also have been down the same road over and over, and know how to stall, obfuscate and just generally wear you down. They are hoping to quickly settle out of court and most times they do. There is one very old class action discrimination suit (Guttierez) that has been going on for years. The famous lawyer Jonnhy Cocoran (now deceased) even had a big ad in the paper, rented out the Hyatt in New Brunswick for a meeting to discuss dicrimination and get others to sign up for the class action suit, etc. Didn't help.
Another thing is that today, many lawyers will not touch your case on a contingency basis, so you'd have to pay them to defend you. Otherwise, they'd be putting in hours on your case and not get paid when you don't get that windfall you were hoping for. Even with the best case, they will wear you down and you'll just want to get on with your life. Plus, it tarnishes our name to other companies, who you can bet will find out you tried to sue your former employer. Much to consider.