I think the meteorological experts out there will confirm that, from an adverse weather event point of view, south-east Essex is a sensible place as any to build an airport in the UK, particularly if the R/W direction is as it is at SEN.
But that doesn't help the people trying to get away / home. I wonder how well the airport scores in assisting pax compared to others. I doubt whether they have many spare staff around to process overnight accommodation etc. I have only one experience of being stranded overnight - in JER, and it wasn't good.