There are so many non-intuitive, badly designed issues in this game, its getting to the point where

making lol2 would be better option and abandoning this altogether.

i will count off the top of my head what i can think about.

1. MMR influence in ranked, unless you do extensive research you will likely not understand what is going on at all.
2. ranked MMR not affecting your non ranked games. (im not saying it should, im just saying its not clearly explained and easily accessible information)
3. report system does not show post or pre game chat, and randomly sends you chatlogs when you arent banned for chatting to begin with.
4. Q W E R and all items are coded and treated as spells. even when they dont seem like spells.

there are just thousands of questions i see daily on these boards that shouldnt even be a question, it should be obvious why it happened.