Season 5 is the worst balanced season yet, jungle "variety" is non-existent too

First, lets talk about the jungle. Champs like Vi and Jarvan have high early, mid, and late game threat. Champs like Lee and Shaco are complete troll picks in comparison. Riot should either just disable them or make it a reportable offense for not picking Jarvan, Vi, or one of the leftovers like Warick or Volibear. There is no reason anyone should want them on your team and it's getting old having to tell people not to play Lee and Shaco when it's a free loss if both teams are of equal skill because they're just not useful when the game lasts longer than 20 minutes.

Next you have the area of support and support itemization. Support balance has been completely broken ever since Braum and Thresh were introduced. A Thresh, Braum, or Leona with 3500+ hp, 300+ armor, and 100+ magic resist, is far more useful than having some girl on your team playing glass cannon Nami with a useless Mikael's cowbell that dies in almost 1 hit to the full build enemy ADC, while it takes days for you to kill the enemy Thresh. Building tank items on the support is far more useful than garbage items like Mikaels, so you need to either drastically change them or delete them so random idiots will stop buying it and ruining everyone's elo on their team when buying just about ANY other item is better.

Then comes the area of champion balance. If this is supposed to be a skill based game, champions like Annie need to either be removed or reworked. The skill cap is far too low for just insta gibbing people, which is why you see all these Chinese elo boosters playing her now. Removing DFG doesn't help, that actually made the champ easier to play since you just gave the champ buffs afterwards. Vi jungle is the same way. It takes diamond+ elo Lee sins to gank with the same efficiency of bronze Vi players. Using Q + flash + Ult on Vi just gives you far too high a chance of pulling off succesful kills with absolutely no skill involved.

Lastly you have broken top lane issues that just never go addressed. Champs like Irelia are banned a lot in tournaments because her broken game mechanics are continuously ignored by Riot. If you attack her, she benefits, if you don't attack her, she benefits. This is not a valid equation for a PvP game Riot. Just remove the stupid stun and get it over with. There's plenty more outstanding issues in top lane, but it seems like if Riot can't grasp dog-brain level PvP balance concepts like this, there really is no hope.