I think that's not so much a typical persons opinion of Fiat. That's a typical Merc owners opinion of Fiat. And frankly they would think that, because they have very archaic views if they actually think a Merc is still a quality product. I'd have probably replied 'why did you buy a Merc & not get a much more convincing take on quality, like an Audi or BMW'. But then im a bit*h if someone slates Italian cars near me.
A Merc is a nothing car - not that cheap, not that pretty, not that reliable, not that well built, not that good to drive. It's just for people who want to boast over 'dinner' to their equally clueless frends that they 'drive a Mercedes' (said in stuck up, fake posh accent).