Upvote and strongly agree with this.
I hate seeing 450IP champions (and sometimes even 1350s) on free week. They're cheap enough that most players can buy them to try. A 450 is literally 3 first win of the day bonuses...
The free rotation should contain a maximum of 2 champions that are 1350 and under (and not two 450s).
Likewise agree with the point on 6300s (and would add 4800s to that). These champions take a lot of effort to purchase and you really don't want to waste that kind of IP on a champion you don't end up playing all that much... So a 6300 comes on free week and you try it once or twice and enjoy it - do you buy it or not? Next thing you know you buy it and it turns out those 2 games were just good games and you actually aren't very good with the champion and it doesn't suit your playstyle. Or you choose not to buy it yet and wait for next time and like it again and just waited like 6 months to buy a champion you loved.
They really should put two 6300s, three 4800s, two 3150s, one 1350, and then the remaining 2 can be random. Not to mention would it kill them to put something like Yorick up? I know they have selection criteria but how am I supposed to learn how to play against a champion that is never picked and never free? Or to experiment to see if I like them?
Although I'm not sure, I may have seen Yorick free once. Maybe not on rotation, possibly during an event?