I believe climbing the leaderboard on console is pointless, because of rampant cheating, no?
This is, as far as we currently know, not true. It looks like someone may have found a way to manipulate gambling (or another gear related RNG process) but it's not confirmed as far as I know and certainly not rampant. And as seasons is required online, it's something that Blizzard can hopefully resolve next time around.
On a semi-related note, its pretty disappointing how much some class leaderboards are dominated by certain builds. I think the top 20 barbs (in hc) were all more or less an identical leapquake build, and similar with demon hunters and shadows set and saders and hammerdin. There was more variation when it comes to to sets in, say WD, but I think I counted 2 people in the top 50 not using a sacred harvester. Monks are dominated by a more or less identical LoN, with a few Shen Long Innas hanging just back. Which leaves Wiz, which I didn't look into as closely but it had some variation, mostly looking like Manald Heal variants
I guess we're past the point of random freestyle builds being anything at all competitive with sets, but it would be nice to see some build variety even within the specific sets themselves. Let alone the different class sets being somewhere around even with one another.