CJackson95 said:
To be honest, I wasn't bothered too much about this topic enough to research and produce a full essay on it, but if you were describing to someone about Portal, you would not say it is an FPS, ever. It probably isn't even classed as an FPS. There is no weapons for the player to use and the portal gun doesn't really count as one. The enemy's using weapons is irrelevant anyway so I don't see why anyone would classify it as an FPS.
Alright, let me break down the sentence and add my two cents:
While true enough, you might not add that Portal is a FPS doesn't mean it's not a FPS.
It is classed as a FPS.
There are no weapons in Portal. So what? Explain to me why it's necessary for a FPS to have weapons.