Capital city of Ireland it may be, but it sure doesn't know how to behave like one. Good town to go out in I'll admit, but the infrastruture of the city is literally groaning under the weight of the population. Public transport is deplorable, and the taxi drivers of the city should all be lined against a wall. You think Microsoft have a monopoly? You should see these guys - the only city in the world I've lived in where taxis can pick and choose their customers seemingly at random instead of lining up for their custom... makes getting home after the pub very messy indeed.
Oh - the pubs. Some very good ones indeed, the only problem being that the majority of them close between 11pm and 11:30pm. The ones that stay open later (and none stay open later than 1:30am) charge insane prices for the beer, presumably for the 'privilege' of being there.
All in all, great place for a weekend if you plan ahead, but if you're used to a real city, don't plan to be impressed with a longer stay....