It’s definitely happened before, though I couldn’t say to what extent. The reason has been that if they rate games from major developers too poorly they stop getting access to their new games before release.
I care very little about critics these days though, and it’s mostly for the reason you suggest, differing opinions. If they don’t like the same types of games I like, what good is their rating to me? I’m not taking the time to try to find a critic that has similar tastes as me.
The world’s most valuable franchise is Pokémon. I will say the list specifies the MCU so IDK if that includes all Marvel stuff.
https://en.wikipedia.org/wiki/List_of_highest-grossing_media_franchises
Based on the summaries I’ve seen for chat messages at work, it’ll be a mixed bag. Often times I find it pretty useless.