The marseille fans have always been very powerfull (the group of fans sold the tickets themselves) and can managed to put a big pressure on the staff and the players.
Sometimes good, sometimes bad. It is always harder for a player to play in Marseille than in any other team in France (PSG except maybe).
Looking at the league 's standings, Marseille is not bad, but i thinks the fan have not accepted Drobga departure, which symbolyse the club's lack of ambition.