Madrid is what we wanted RYR to do - a previously unserved major destination, so hopefully expanding the market and not just nicking market share.
Berlin is EZY doing what they do with shortish city runs - don't be surprised if they drop it again in a couple of years for CDG or AMS.
The three RYR polish routes are odd, mainly in terms of them all starting at once - presumably RYR have spotted an underserved polish market in the North east. I don't think these are primarily aimed at the city break market.
I think the city break market in the NE is limited - once people have been somewhere they want to go somewhere else, which is why we get this rotation of city destinations.