Friends of ours were booked on Monarch to return from Portugal but their flights were changed to Ryanair. They couldn't land at Manchester or Liverpool for some reason so were told they would be landing in Dublin with three hours wait then taken to Manchester. In the event, this was on Monday, they still flew them into Dublin, knowing that the airport would be closed because of the wind. They were dumped there, no help offered at all, complete chaos. We got them a hotel and the first flight out was TODAY, so two nights in a very expensive hotel (not much choice, all had doubled their prices or were completely unavailable), extra subsistence etc, no compensation offered as yet.
I wouldn't fly with them if they were the last airline going on our route, no sirree!