I do think having some sort of rail to the airport would be good. After the France match I hopped on a bus to the airport and after waiting to get on I found out that you needed exact change to get on. Fortunately the driver let me on for free but I would've been screwed as I slept in the airport. Furthermore, they don't announce the stops on the bus so I was never sure I was even going to the airport or if the bus actually pulled up there.
One thing I did like was on the city rail (Luas?) they had the times showing how far away the next train was.
Well thats my experience on Dublin transportation.
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