@Axs5626Sxa5001 I take it that you are also in a 3 stack? Otherwise it doesn't make sense that game would put you on highest difficulty. I have heard SBMM is pretty aggressive for pre-made team.
Do I like SBMM? Not how it works currently. I often get lvl 10-20 on my team, if I don't 1v3 the game is lost. I am not a pro player, I can only do so much. I would rather that game matches me evenly, I find those matches to be more enjoyable.
I have also lost to a fair amount of pre-made teams, sometimes even 4-5 games in a row as a Solo-queue player. And then next game, I win 3-0 without even trying which is again not fun at all.
What's your win rate? From my experience, Arena MMR has the end goal to give you a 50% win rate.