Megathread of Problems In This Game
I will edit this as people comment more that I forgot about.
(The majority of the boards agrees with these ones. But first, the most important one)
1 As a playerbase, new champions coming out to keep the game "fresh" is one of our lowest priorities. Fix your old champions before you flood us with new ones

2 Shaco is so item reliant that if on hit items aren't S tier or broken then he is worthless
3 Duskblade is the new DFG but with a vision control passive as well and ultimately should join the dead items list
4 Kai'sa is broken in multiple areas
5 Graves is broken in multiple areas
6 Talon is broken in multiple areas
7 Irelia is broken in a few areas
8 Essence Reaver needs to be reverted because its only effectiveness is on Lucian and sometimes Renekton
9 Damage is overall too high
10 Sword of the Occult needs to come back
11 Towers need a big buff
(You might not agree with these ones)
12 Boots of swiftness should be removed because it's either strong and used by everybody including ADC's, or is too weak and is used by nobody, and there really is no need for it
13 Edge of Night needs a buff
14 The precision tree gives way too much attack speed. I understand that it is necessary for ADC's but having Irelia at 1.5 attack speed with just triforce and conqueror is a tad stupid.
15 Specifically, Irelia's auto attack range is way too high 15.5 Furthermore, if your goal was to make Irelia a fighter/bruiser, making her that mobile with that many reset opportunities on her Q while not having much damage from anything else in her kit makes that rework ultimately a failure. Sure it may be fun to play Irelia but her intended goal was a fail.
16 Riot's balance team sure likes to ignore low elo as if your playerbase isn't 90% gold and below. I understand that you shouldn't balance the game around them but throw them a bone or two.