Well one example would be how the characters are all extremely overdramatic and prone to hysterical outbursts at the slightest provocation, or how they enter a fever if they get into an argument, etc.

This is very obvious after reading something like George Eliot's Middlemarch, who has a very realistic depiction of the characters rather than Dostoevsky's overly dramatic approach. The latter, imo, just makes the characters impossible to empathise with, because they act in ways that no common human ever acts.

This is common in 19th century writing, but in the 20th century it seemed to improve. One of the reason George Eliot is so praised is because she eschewed that convention far earlier than authors like Dostoevsky.