I played for a few weeks and I am really enjoing this game. I often look at the reputation ranking to see the best teams and perhaps steal ideas from them. I tried to figure out which are the best leagues around the world and I was surprised to not find any statistic regarding them, so my suggestion is to have a ranking for leagues based on the sum or average reputation of the participants.
I add that sometimes I make the average reputation of some leagues with the calculator and it takes me a while so a ranking would make things easier for me.
To add to this, I also think there needs to be a filter in the league search results that takes reputation into account.
Eg, I'm trying to increase my reputation but I'm struggling to find a league with players that are significantly higher than what I'm already at.