Overall it is a good idea, but i wouldn't be myself if i can't criticize things ;D
Its bound to the mastery system wich has to down sides :
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It makes the Hextec-crafting a SR only thing witch is kinda sad
(things like that could attract causal players since they can also get free camps)
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It could lead to more flaming.
Note: Now not only winning or losing matters but also the ingame performance, so things like KSing cound become a thing again)
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The mastery system gives you better grades when you play off meta champions, what will lead to more flame (we all know this is dumb, but also true)
Note: The system compares your performance with the performance of other players that played the same camp in the same role.
Less Players playing -> less competition -> easier to get a good grade
Also the Hextech-Crafting is a Skinner-Box mechanic, and thats not a good thing in my opinion.
When you ask yourself: "What is a skinnerbox mechanic?" Watch this:
https://www.youtube.com/watch?v=tWtvrPTbQ_c
Disclaimer: English is not my mother-language, and i'm terrrible in learning new laguages (kappa)