Yes, Difficulty of game is reduced. Luckily I also hit champ 3 today. I have only level 5 summoners.But in this journey, I have defeated some level 7 and level 8 summoners too.
I think, too many cards and options, confusing the players and they are putting sub optimal team .
Otherwise, I think it is almost impossible to beat level 8 summoner using level 5 summoner.