honestly, i think hes close to being in a fine spot right now.
if you want to look into possible changes, to help him out lategame a little more, then remove the self slow on his rank 5 spin.
i remember, that back when he was reworked shortly before season 3, the self slow was added as a mechanic for the lane phase. it was supposed to make it harder for him to kite or chase other melees through minion waves. it was supposedly added to give other melees more counterplay against him during the early lane phase, so it would open up buffs to his lategame.
the problem with the mechanic is, that it screws him over throughout the entire game. especially in jungle chases or teamfights down the lane later on it happens, that you scratch a random minion, and poof. people are walking out of your spin and start kiting you.
considering that it was never intended to impact his lategame, it would be a good idea to remove it on rank 5 judgement.
other possibilities would be slight increase on his w passive to give him a tad more resistances lategame. a compensation for what was lost, when the w passive was nerfed from 20% total resistances to 20% bonus resistances. (honestly, this could have been done back then, when the change was made).
the upcoming
changes might actually benefit him pretty well. what he needs are better sources for cdr. since the
cdr nerf and since the stat has been removed from
, it has become incredibly hard to hit cdr cap on garen. there are simply not a lot of offensive cdr options for resourceless ad casters. being able to reach 40% cdr again, and having his abilities available more often later on is going to help him somewhat.
one thing people do horribly wrong on a regular basis (like a certain chinese pro), is to mistake him for a tank, and build nothing but health and defenses on him.
if you actually make use of his crit scaling and build a couple of offensive items (examples
) mixed with 1 or 2 defensive items, he can have a pretty good impact lategame. most of the time, 2 or 3 dedicated defensive items like
or
+
with the rest in offensive items, will do fine on him.
in the pro game in question, i have seen the garen get the drop on the enemy kog maw multiple times. if he had built some amount of damage, he would have actually killed the adc and have some influence on the game instead of failing horribly.