Why can't we all just get along?
As far as i can make out Dublin gets completely shat on by everyone else. A few things.
It's funny that, while you don't tend to hear 'Dublin is great' rubbish being thrown around by Dubs, there is this urge to pick on the Dubs like they are asking for it. It's more likely that pro-'where-i'm-from' rants are intiated by the lads from the South from my experience.
Getting uptight about being called a culchie is wahey over the top especially given that almost everywhere else has names for places outside their own: j@ckeen, townie, l@nger, etc.
Dublin gets more media attention because it is the administrative/transport/educational/capital of Ireland. About 30% of the population live here. It's like the sports results on the radio. Unless an exceptional event is being reported, usually the most popular sport is reported first. That's the aim of the media - to satisfy the most amount of people as quickly as possible. (BTW, if you think traffic reports are inaccurate elsewhere in the country, you're experiencing the same problems as faced by Dublin road users and I don't know why you would assume that that just happens outside Dublin.)
Too many people not orignally from Dublin will p!ss and moan about it till the proverbial cows come. And it's always about the characteristics associated with any comparable city (house prices, traffic, crime, concrete jungle) but at the end of the day, culchies (ahem) as a group still insist on gravitating towards the place.