Polish uses the Latin script, and this makes it easier to learn than other Slavic languages like Ukrainian, Russian, Belarusian, Bulgarian or Serbian, which use the Cyrillic script. So, when learning Polish, you don't have to study an entirely new alphabet, you only need to be acquainted with several specific diacritic signs and diagraphs.
When you learn Polish, you gain access to the other Western Slavic languages like Slovak and Czech. Although these languages are not mutually understandable, they share a lot of similarities, and this makes the process of learning them easier.
Learning Polish will give you the chance to learn more about a country which has one of the most turbulent and exciting histories in the entire Europe. The history still influences the life and politics of Poland today and can give you some understanding of the current political climate in the region.
Learning and mastering Polish will allow you to access one of the most interesting and fascinating libraries in the entire world. You get the opportunity to interact with the words of some of the famous Slavic poets you’ve ever heard about. Also, you will understand that Polish literature is very diverse and different.
As a language, Polish has some sort of familiarity and exoticism. Some Polish words might look familiar, while others look mysterious or difficult. Parts of the language reflect the other path of Indo-European development and are influenced by some directions like Iran and Turkey.