Champion inbalances

Lately it's become even more blatantly clear that certain champions have become out of control. Massive tanking damage sponges that deals ridiculous amounts of damage while basically ignoring tower shots and champ damage like snow falling on them. Udyr, would be a perfect example of this. Builds strait tank, gets skirmishers and devourer and then maxes phoenix stance. Tons of free damage that just melts anything else, but no damage items other than the jungle item, soaks all the damage anyone throws at him like it's nothing and walks away. Sion is also a common culprit of this. There is no justifiable reason that tanks should be able to soak this much AND deal ridiculous amounts of damage, and yet still be considered "balanced".

As well lately it's becoming common that tower AI is vary.....ineffective, to put it kindly. It's way to easy to bounce tower aggro between people and dive players under tower while taking hardly any tower shots if any. Mid game the towers don't even tickle the previously mentioned champions. They need to deal % damage based off hp in order to have any effect against these tank/assassin champs. Or times that the tower doesn't even aggro at all on someone who is clearly in range and attacking someone.

These are some quality of life issues that need a closer look and are becoming increasingly frequent.