I think the changes will be great. People are just looking at it saying "Great, it's a casual game now".
I have to wonder, this is a PvP game... why does anybody care that the minions get hurt? The first few levels have always been the most boring, since you can hide behind your iron curtain of minions. They deal around 12 damage at level one, six per wave, with 1.25 attack speed. That's 90 damage per second if you manage to aggro all of them. Most champions level 1 nuke does around 80 damage, with a 5+ second cooldown.
This nerf is going to make early game poking/harass more daring, more dangerous (due to potion nerf), and overall, more epic.
As for the jungling, have you ever been too low on life to help protect a turret or miss out on a great ganking opportunity? Of course you have, because all but a few junglers are required to go back at some point (usually after first clear). So these jungle nerfs mean you, as a jungler, get to go gank earlier and with more health.
And sure, some heroes will be broken temporarily, but all the more reason to be improved and normalized in the future. (...That would have sounded a lot better if Riot weren't the ones in charge of the balancing)