I suppose it is subjective and I ran hunter Titan before the nerf and used it a few times and found it underperforming since the Nerf and never went back. Most the top players I looks at with their builds avoid it as well, but again subjective.
Mercury boots have become essentially mandatory with the cc spam, which is a shame for diversity. I long await the transition of runes like Legend: tenacity to make it's way over.
It isn't just aram, all modes are flooded with cc. I can't count the amount of times I've sat still for the matter of 4+ seconds with mercury, sterak and courage with Garen and died being unable to do anything. Can't avoid it really either especially with champs like Morgana and Veigar.
It isn't a coincidence that Olaf rather recently has found a huge surge in win/popularity. CC is a real problem and he is about the only champ with built in counters. I don't want to be pigeon held to a.singular champ to counter a meta.
Diversity, ...