It's a comedy, of course, they're gonna spend most of the trying but failing to complete their task, and also, almost every single comedy manga/anime/western cartoon has a character breaking the fourth wall, grow up. It's called an art style, if you don't like it don't focus on it, also, they drew lips correctly, contrary to mostly all popular anime or any anime for that matter. It's called "main characters" They are focusing on the main characters, the protagonists, not the 3 other deuteragonists. Another thing is, most of these things you are saying are really opinionated, barely a few of these are actually factual statements, just your half-assed opinion.
