I went through my placements and I'd honestly advice anyone else to hold off a bit. It's a complete clown fiesta. No one is aware of the new mechanics and if they are, they tunnel on it way too hard. People flame others for giving away first blood, it's wild. The changes make games super snowball so most of them end before 30 minutes, making a lot of champs borderline unplayable.
I lost 7 of my 10 games so far and I think I'm going to hold off on playing ranked until (hopefully) they'll hot fix in some nerfs to the mechanic to balance things out a bit. Unless you're someone that is really good at playing early game lane bullies I'd suggest others to do the same.