Steam recently changed the default privacy settings for all users. This may impact tracking. Ensure your profile has the correct settings by following the guide on our forums.
Prototype ≠ Crackdown
Just because they're both sandbox games, have collectable orbs, and let you jump incredibly high doesn't make them the same game. Crackdown was a total sandbox game, Prototype is fairly linear (for a "sandbox" game). Crackdown let you level up your skills at whatever...