This way works great for single player campaign style games. This way does not work very well at all for FPS where multiplayer is the focus. If you wait that long, everybody else knows the maps like the back of their hand and you are essentially a bullet sponge that helps twink opposing players K/D ratio. Plus, you're just probably not going to have a lot of fun with it until you REALLY cut your teeth on it the hard way.
Nothing like jumping into a game where pretty much everybody is on the same page tactical wise.