I've lived there for a little over 3 years now, and I would recommend it.
Depending on where you live, you can get quiet, leafy areas within easy walking distance of the town, pubs, restaurants and the train station.
There is a large number of fast food place, true, but there also are some really decent restaurants, and some of the pubs do really decent food as well.
Traffic is surprisingly good, considering that there is only one bridge. I've never had any problems at all. But depending on where you work, the N25 and the Jack Lynch tunnel can get very busy at peak hours, as was pointed out earlier.
There's a lot of sport clubs, the leisure centre is great (well, the pool is usually full of screaming brats during the day, but thankfully they've got adult only hours between 8 and 10 most nights.
The only downside I ever found was that state the library was in. It's being renovated now, so I'm hopeful.