I agree that Marseille has been consistent awhile now even from last season. But at some point loosing a few games made them lost their chances to PSG but this season I do not know if they will be able to maintain more consistency. This season and be able to do better possibly ahead of PSG this season but if they must, it will require a lot of work because they are not of equal strength with PSG at all and they do not have same team strength or quality.
Marseille last season had a record of 9 losses. However, this season, after three matches, Marseille has already incurred two losses. I'm not quite sure they will be better this season, but they still have time to improve and strengthen their performance in the upcoming matches. They need to avoid losses and maximize their winning points.
I do not expect the competition in Ligue 1 to be very tight, but at least the top positions in the standings will still be contested by several teams.