The prices in Tokyo can be very expensive, and that applies to food too. Yes Shakey's Pizza is a standard place to get American-style food, but the appealing thing about eating here is that they have an all-you-can-eat buffet at lunchtime for a very reasonable price.
You can order a la carte off the easy-to-read menu of course, but why would you if the buffet is available? They usually have a few varieties of pizza set up, along with a few other menu selections like salad, spaghetti, chicken wings, potato skins, and french fries. Diners quickly grab the pizza slices up, so the pizza rarely has a chance to get cold. There are usually varieties like sausage, ham, cheese, pineapple and seaweed (yes, bits of seaweed on a pizza slice!). You can order beer or soda, neither of which is included in the price of the buffet.
Dining here is not a bad change-of-pace from the sushi and noodle dishes served up at local Japanese restaurants. The buffet is a set rate, so there are no real surprises when your bill comes. Of course, there are no real surprises on your plate at Shakey's, but at least you will probably leave with a full and satisfied stomach.