There is alot of critisicm aimed ND and other mods because people think they are ripping off the premise of NS.
But I found something interesting on the TF2 wiki entry:
QuoteIn addition to including and improving upon many of the classes present in Team Fortress Classic, TF2 promised to introduce several new classes. The most promising of these classes was the "Commander" class, which put the player in control of a team of players with the task of coordinating them to victory. This class would add strategic elements to the game, borrowing ideas from the genre of strategy games. In an interview, Robin Walker, the game's lead designer, said the game was more appropriately labelled a first-person strategy as opposed to a first-person shooter. Another feature was the much touted in-game voice communication that would allow players to talk to one another to coordinate strategies. Such a feature is no longer unique and is standard in most current multiplayer first-person shooters.Many of TF2's features and themes, including squad-based command structures, commander views, and the fusion of RTS and FPS itself, have since appeared in other games such as Natural Selection...
Any thoughts on this?