Balance completely broken right now
Having had the chance to play league for awhile now, it is glaringly apparent that the game is broken and players will quickly start leaving if it isn't fixed. I am all for balance and counter play but that is what is sorely missing right now.
The first and biggest issue I want to talk about is mobility and damage. This is ridiculously simple to fix. The more mobile a champion is, the less damage they can do. It is pretty much impossible to counter someone who can jump in, do a crap ton of damage, and then escape without much chance of dying. Champs like Lee Sin, Kalista, Ahri, Katarina, LeBlanc, Rek'Sai, Nidalee, etc. need their damage nerfed or their mobility reduced. There is no counter play when a champion can burst you down and get away with no consequence. Champions with little to no mobility need damage buffs or better CC. (Ashe is a perfect example, up the AA damage).
The second is tankyness and damage. The more tanky a champion is, the less damage they should be able to do. When Gnar or Sion build all tank items, their damage should be next to nothing. They should win by attrition not by bursting someone down with little chance of dying.
Here are glaring things that need fixed. -Snowballing that is unreasonable (Akali, Katarina, Talon, Riven, Fiora, etc.). Champions that get one kill ahead and it's pretty much GG. Make them get at least a couple good plays and earn it. -Zoning. Some champions can completely zone out a lane and their is no real counter play. Increase CDs or mana costs. -Azir. Has great utility and range, so he doesn't need the huge damage. -Cassiopeia. Either nerf the late game or the early game. She is way too strong the whole game. -Fizz. Increase the CD on Playful Trickster. He should only be able to use it once a fight/skirmish. -Gnar. Reduce boomerang range. It out ranges most ADCs. Reduce damage in Mega Gnar form unless he builds for damage and loses tankyness. -Heimerdinger. Reduce turret damage and increase rocket damage. Make him require at least some skill to play. -Irelia. See tanky/damage paragraph above. -Jinx. Increase mana cost of rockets or reduce damage of minigun. -Kalista. Huge nerf to damage. She is very hard to hit and has a great ult. Make her earn kills by wearing down opponents. -Lee Sin. Get rid of ward hopping. -Master Yi. Meditate should take 50% longer to heal same amount. That way he has his sustain but can't cheese it during battle. Another champion that takes almost no skill. I got a pentakill with him the first time I played him. -Miss Fortune. Buff her ult. It is so under powered it's sad. Increase by 20%. Her ult should do WAY more damage than Lucian's since she is not mobile while doing it. -Morgana. Reduce length of dark binding by 1 sec at max rank, increase damage of Tormented Soil. Easy fix. -Nidalee. Reduce spear damage 50%. Most broken skill in the game. It is somewhat dodgeable, but only if you can see her throw it, and she can throw it a lot, so it will hit and take 50%+ of your total health. It does more damage than 90% of the ults in the game. She has awesome mobility, don't let her have such an OP poke. -Nunu. Reduce channel time of ult or make him immune to CC while doing it. -Orianna. Zones too hard. -Pantheon. Nerf Spear, increase damage of Heartseeker Strike. -Poppy. Better early game, weaker late game. -Quinn. Fix ult. If she becomes a melee, increase armor and magic resistance by 20% so she can fight it out. -Taric. Better early game. -Thresh. Nerf AA damage. -Urgot. Make his ult instant or re-do completely. -Vayne. Weaker early game since her late game is probably the best in the game. -Vi. Way too tanky for that much damage. -Wukong. Nerf tankyness. -Yasuo. Wind wall way OP. It is a better defensive skill than Braum's Unbreakable. Make at least ults pass through it. And do away with crit passive. His other passive is already very strong. -Yorick. Increase length of ghouls by rank.
There are a few other minor tweeks, but fix these and the game would be so much better for diversity, strategy, and fun. I hope you like some of the ideas.