They finished 2nd in your league. Are you sure that's not just your rivalry with Marseilles talking? I don't know much about French football other than Lyon got the better of us recently and they didn't even qualify for the CL from Ligue 1 last season.
City got one of the sides from Group 1 that you wouldn't have minded getting. But the sides from Group 3 and Group 4 were tougher than they might have been. I think of the English clubs, we have the toughest draw as there are no walkovers. Observers think Utd have a tough draw. They have a job finishing above PSG, but they also have a Turkish side few will have heard of, and they play Leipzig. Leipzig did well last season for one reason only (Timo Werner).
Nothing to do with the rivalry. Ask any french fan or any L1 follower. OM is trash.
They finished second last year, yes, but they were starting to lose a lot of steam. Teams were catching up to them and then Covid happened and secured them the second place.
Add to that they didn't play a lot of games that season since they weren't qualified for any European cup and they were quickly out of domestic cups as well.
Now, take the same weak team and make them play every 3 days due to CL and it is a whole other story.
For the record, their last European adventure was hilarious :
They managed to finish last, only taking one point out of Apollon Limassol, a club we had never heard about before.
But well, their last CL adventure in 2013/2014 was something else :
They are one of the few clubs (i think the first) to finish with 0 point.
Lyon is definitely a better club in Europe, and overall, than OM post Tapie days. Lyon is also the only club in France that has managed to beat us or draw us regularly the last few years . In a good day for them and a bad day for you, it is understandable they could beat you. But OM is not the same. You'll be surprised how bad they are compared to OL.
People are talking about MU getting an hard group and maybe finishing third but PSG is a lot weaker than last year. I can't safely say we are going to win this group. It will be hard.
PS: that being said, OM has only one quality : being a counter attacking team. They cannot play, dictate the flow of a game. They are struggling a lot at home this season because of that reason : they are expected to attack and can't counterattack.