What lvl are you? I guess 8?
In lvl 1 an extra star is a huge different, it is 20% better player at lvl 8 you are down to around 5% and there is almost no different at all on a player with 59 or 60 QR.
Don't look at the stars, don't ignore the other team because they have avg one star less then you, don't think it is a easy win, your team is only a few% better and if you don't have the right strategy them few % will not be enough.
Even Messi have bad days at work.
I won my CL this season, i beat two teams with one star more then me, one team had 22 scouts, i had 2.
Only team i couldn't beat was a team with 1 star less then me, it was in the group, i draw both games against him and that was the only two points he took in that group
He was last in the group, only 4 teams took less points then him but he is the only one that have not lost against me, is he one of the worst teams or is he really the 2nd best team in that CL?