I tried it once having a no friends league. Hated it. Very boring. Random lower quality teams. Got the Undefeated Achievement and every time I see it I think 'boring'.

If someone of higher Quality sends me a friend request I accept. If I want to change the shape of my friends list I add teams from the latter stages of CL.

I want to win but I don't need to win. I'd rather enjoy being second that be bored with 1st.