A capital - like any other
I did not spend too much time in Dublin, but a day or two was enough to discover the centre. The landmarks are beautiful, and I loved how there was music on every corner in the Temple Bar area. But if you'd like to get to know Ireland and the Irish people, you have to leave Dublin after a couple of days because there's a chance that you will meet more Germans or French than Irish.
Insider Tip:I would recommend going out to Howth so you can really look into Ireland's Eye. Just get on the DART train that leaves from Connolly Station, and if you had enough of the noise and such, you will definitely love the nearness of the sea.