his abilities are telegraphed and he is not just a ball of stats.
its because everything he does is so telegraphed, why he is easier to deal with for people with faster reaction times and strategic foresight, than for people at lower ratings.
meddler said theyre looking into updating him aswell, but another rioter who would be in charge of the update mentioned that they dont have a specific idea what to give him, and i think it would be a terrible idea to force an update without doing proper research.
in my opinion they need to prioritize on the villain mechanic and refine the concept.
other than that, there are ways to improve garen without changing his kit - at all.
if they want to buff him for higher ratings and add skill ceiling, they should look into giving him animation cancel mechanics for his q.
a full rotation on garen should look like:
auto attack, q, auto attack, spin, auto attack, ult.
usually the long animation time on his q is the weak link in that chain. it gives his opponent enough time to react with a defensive ability in the timeframe the animation plays. (yes, thats what a telegraphed ability is)