The point, Mo, is that the formation is irrelevant when players do not do their most basic of jobs. Getting caught on the counter time and time again is not a symptom of the formation.
The basic rule of defending is that you do not want to expose your last line of defence to your opponents. Whether it is a back 3, a back 4 or a back 5. The players that sit in front of the defence have a very important job to do and without them, our last line of defence is exposed. If you do not expose the last line of defence to your opponent, it makes it harder for them to break it down and makes it harder for them to score. Seems very obvious but we are failing to uphold that at its most basic level.