The point about no late rail services was made by LTNMan among others long ago, and it is something that must be sorted out quickly. If it's a true account, I have little sympathy with the airline or airport over this alleged treatment of a paying passenger - there should be warnings about the lack of public transport after 11.00 p.m. on their websites. On the other hand that reviewer has little idea of geography if he thinks Southend is closer to France than London - it isn't Manston or Ferryfield (there's a name for the older amongst us)! And just to save you searching for your atlas, it is 67 miles from SEN to the French coast, 35 miles to Central London.
The other reviews are excellent though and show how well the airport is operating during the hours that public transport is running. Stobart certainly have a success on their hands, but I hope they are reading forums such as Europe-Airports.com to help them iron out teething problems.