As someone who also learned multiple languages, the most typical result if grammar focused classes is that you cant use the language at all for years. And yes it is consistent outcome for majority of the students.

Like, outcome of language classes you describe are people who cant watch movies, cant listen to podcasts, cant talk with natives ... but are decent in solving grammar exercises. And to add insult to injury, the whole process so massively sux, that you are likely to conclude that learning languages is not for you.