And they aren't clear when to use them either, it's kinda cute when they look at you questioningly if they did correctly after formulating a sentence.

Neither does Polish. I know at least one polaka who confuses the/a(n) 15% of the time.

it doesn't really use article at all.

it's highly cased, the cases and inflection do all the work.

I think it's the case with most Slavic languages. My wife's native tongue is Serbian, and knowinf when and how to use articles was one the hardest parts of learning English for her.

Most (if not all) Slavic-family languages do not. Neither do Japanese nor Korean. Some languages have a partial system (i.e. no a/an but the to show definiteness). Some languages have both but do it differently (Scandanavian languages suffix the definite article on nouns, but the indefinite precedes the noun like in English). Languages are messy and neat.