The game is completely broken right now. They haven't fixed anything since they ruined it all. They've been very conservative with what needed changes for some reason after they went nuts breaking everything, and in some cases made things worse.
An example: Thunderlord's not working properly, then having reversed ratios of 20% AP and 10% AD, not mentioning that in notes and changing it to 10% AP 30% AD. 30% on AD is such a dramatic increase that everything AD now takes it, ADCs included.
There's like 20 broken champions right now and only 6 bans, ranked is a shitfest of who got the most broken champs.