If you put me in B5 after i finish placement games, then don't make me play them at all. Waste of time.
I got 5 - 5, not the best thing, yes, but that is same when someone gets 0 wins... you can't go lower than B5.
If Riot thinks that 10 games don't show the skill enough and would be risk to place winners higher, then why have that system in the first place, if they don't trust it?
At least give me B1 or 2...