I lived in Poland for over a year and, in general, was not impressed with the cooking. While some dishes are arguably very tasty, i.e. good Barszcz soup (beetroot soup), the cuisine is essentially pork, potatoes, cabbage and...more cabbage. Spices other than salt and pepper are rarely used.
Pierogis are a great little treat, however, they are also limited in ambition. Essentially just dough and various fillings, the most popular of which would probably be Pierogi Ruskie (Russian Pierogis) comprised of cream cheese and potato puree. However, they are generally served boiled with some fried lard/onions and a pool of butter. Sauces, for example, havent really hit yet and few establishments stray from this norm. Some people squirt soy sauce on pierogi, which I tend to like as well as it adds salt.
Despite the rather limited ambition, some people spend days cooking one meal, which does add an element of intrigue and depth to what otherwise would be a bland dish.
Christmas meals have 12 courses!