In Dubs if they come early, you're screwed.
You forgot to mention that Dublin you can only exit the bus via the entry door, the other door (at the middle) is closed and I have yet to find a reasonable explanation for it. The newer ones only have one door because of this.
How is this in Poland? Are buses on time, generally? How is the fare calculated? Do you have to pay every time when you have to switch buses on the same trip?
They are on time (4 minutes late would be "very late", there are different payment methods, hourly tickets, student tickets, etc ... a normal ticket is is to the end of the line.
It also works on the honour system, whereby you buy your ticket in a kiosk, from the driver or the modern ones you can buy from an onboard machine and you cancel it yourself, like in the Netherlands.
Also, since I have to be in Warschau soon for a day, I would like to know how much the taxi fares would be from the Airport to the City Centre? Or the taxi-fares in general in Warschau? I haven't got the details of where exactly I have to be yet, that's why I ask for the City Centre. Thanks!
Unlike Ireland a taxi is cheaper if you ring it here in Poland, than if you pick it up off the road.
If you see a cab ring the number, I'm serious.
And my advice is, try to get change to pay for your bus journey, you'll be up a creek without one, if you try to pay the driver with a hundred.