My opinion is that the 2013 Abarth, being the 2nd year of production in Mexico, should be just fine. I'm right around 2,000 miles on my 2013 Abarth, and no issues at all. I feel confident that my dealer and the new car warranty will cover anything that comes up, although like any mass produced item from razors to houses, there could always be some issues along the way. I'm in my 50s, have bought cars all my life, and whether it's good advice or not, I always remember a teacher long ago advising us young guys "never buy a car in the first year of production, since they might not have worked out all the bugs yet". While that isn't why I waited to get a 13 Abarth, to me it makes sense generally, but on the other hand the Fiat 500 and Abarth models have been made in Europe for several years.
Any internet forum is a great opportunity for the issues to come to light, and from what I've seen here on this forum, the biggest issue is getting good service from individual dealers and sales folks, which is not a deal breaker for me.