European Cruises? HM?

Has anyone been on a European cruise? We just got off the Norwegian Dawn & FH is leaning towards seeing Europe like this. The one thing it must include, however, is ports in Ireland.

Has anyone ever done this? What line? Was it worth it or better to go on a land tour?

Thanks so much!

We are taking a European cruise for our HM. It is a 10 day princess cruise we start in London, then Dublin Ireland, Holyhead whales, Belfast No. Ireland, Glasgow Scotland, Kirkwall Scotland, Edinburgh Scotland and back to London. Total of 10 days. FM me if you want more info