The route to Birmingham looks like they had time to get a short, quick rotation out of one of the planes. IMO Manchester would have been a better option considering that there are a lot of available seats on the Birmingham route already. Another alternative for a quick rotation could have been Brittany (with maybe one flight a week to Jersey).
Berlin is a bit of a surprise. I thought it might be a route that Easyjet would look at, but I wasn't expecting Aer Lingus. Services to Germany can work from Cork, but you need to attract business pax and inbound and outbound leisure pax. My worry is that Aer Lingus don't have the marketing clout in Germany to do that.
Even then, Berlin isn't the richest part of Germany. I would have thought that, if they were looking for a route to Germany, Frankfurt or Duesseldorf might have made more sense. Frankfurt would have had the benefit of attracting interlining pax. Duesseldorf may have had a negative impact on Amsterdam yields though.