Are placements accurate?

So I don't generally post, but it feels really unfair how I got placed into Gold 3. Got Placed into Gold 3 with 8 wins 2 Lose (Solo/Duo), also had a 7 win streak. I was plat 3 Last season, which is a grade of drop from my previous rank. How I find this not accurate is because all my other friends got put into higher ranks. Such an example: My friend who I play with in a team, he was Plat 3 last season in ranks. He won only 4 out of 10 and lost 6 of his placements matches. But he got put into Plat 4. Another friend gets 5 wins out of 10 he gets placed into Gold 1. He was Plat 5 Last season. Also in my flex queue, I won 6 out of 10 games losing 4. But it got put into Gold 1. I was Gold 3/4 on Flex Last season. What I don't understand is why in the world does my Solo/Duo rank placements is Gold 3 when I won more than my friends also did decently well in the games scoring S- + in most matches. Seems inaccurate.
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