Bloody hell, can we just start a "help acousticer" thread instead of all these little ones. Your first mistake is to assume that because UCD has a campus it's better. The architecture faculty is on the outskirts of the campus, and really has very little to the main campus, its an isolated world to itself, and having lived on campus, I can tell you that is no fun either, getting into town is an arduous undertaking, at least a 20mins bus ride, and when the course gets really busy the realisation that you haven't left the confines on the UCD compound for three weeks is pretty depressing. (Although in saying that it can be lots of fun for the first /second year, its not all bad)
The best advice I think you can get is concentrate on your leaving cert, get what you need first and the rest will happen later, any choice you make is a risk; some people loved UCD others hated it, and I'm sure the same applies for all colleges. Wherever you end up, they will lay nothing on a plate; you will have to make it work for you.