There's no doubt that Overwatch is a "spiritual successor" to Team Fortress. In fact, that's why I love Overwatch so much. Team Fortress was my PC game of choice, and at the time, there was nothing like it on Playstation or Xbox.
So if you're like me and put many years into TFC/TF2...
THEN. WATCH. THIS. NOW:
IF only Overwatch would make a character like the Spy. He was my main. (Fingers crossed.)