Forget reputations mate.
If you had an Audi A6 you'd be changing ball joints more often, dealing with more electrical faults and spending twice the amount on a cambelt change. The car would have cost you 50% more as well.
They're reputed as having great build quality....as far as the door thud, dash rattles and feel of the car goes, I can't really tell any difference. The exterior panels and paint on the alfa are easily as good as my audi was too.
Reputations are everywhere, and expert opinions are rife. Like German cars are reliable, nissans have legendary japanese robustness, australian cars are 30 years behind the times, yank cars don't handle. Mostly untrue or based on a very limited selection of the cars on question.
If you go on a Toyota forum and read the technical section, it isn't just threads full of people saying "what a lovely reliable trip we had today...no faults to report this year" - It's full of people with problems on their Toyotas (or those people with a prius comparing MPG figures, that may as well have died 10 years ago).
Compare the alfa to any Nissan and you'll find it's lightyears ahead in build quality, probably more reliable, nicer to drive and costs more to repair.