First, Seoul Chako is pricey. It costs more for dinner than for lunch but you get a much bigger selection as well as a friendlier staff if you're willing to wait and pay more.
It is mainly a place to socialize with a group of friends. It gets noisy at times but it's about what you would expect at a BBQ. Also, the restaurant is usually rather full and the waiters might take a while to notice you. The food itself is nothing to rave about, but they offer a nice selection of a bit of everything. For meat lovers, the short ribs and white fish are particularly delicious. The food can burn quickly so it is especially important to change the grill every so often when it starts to stick.
Overall, it's a good place to fill your stomach with meat and chat with friends.