I've watched a decent amount of anime in Japanese, so I'm generally very familiar with how that sounds, but something like Chinese still comes across as incredibly harsh to my ears.
Well spoken Chinese dialects are largely mutually unintelligble (initially; it gets better with experiance and some education but not fully) and ways of speaking vary dramatically. Cantonese is fast and tonal differences between words are kept light; coming from Cantonese the 'proper' way speak do Mandarin seems overly melodic and exaggerated. Mandarin is the soft, more polite dialect, but that's why Cantonese is fun - it''s fast and rude, but genuinely witty at times.