It's always been a PITA in ATC terms, when it opened you had Brymon Dash 7s avoiding hot air balloons outside controlled airspace until someone figured that might er....go amiss shall we say? What's the main point? It's becoming a joke but the world is full of airports in close vicinity which get by way better than this.
It was never envisioned or intended to be as busy as it is now, we are doing that British thing of putting a pint into a half pint glass and wondering why the table is wet. The other thing that kills time now is what feels like LHR holding times waiting to backtrack Runway 27 at peak times to depart.