I feel like no one is playing Hecarim in the jungle
And they really should. The buffs a few patches ago were absolutely insane for jungle Hec. Stat wise, it seems like around 50% of the time smite is taken on him. While I know top Hec is good, the amount of pressure he can put out while still staying very farmed because of the Q change is really nuts.
Not only that, I feel no need to take a mobility spell on him. With Movespeed quints, and boots (generally I go Swifty), you're walking around at around 470 MS, plus the Phage passive and E make you extremely mobile. This lets you take either ignite or TP depending on the team.
Which brings me to my last point, and it's his build. WAAAYY too often I see people with too much damage on Hec. In reality you need one damage item and that's Trinity Force. Anything more than that is pretty much overkill. Cinderhulk is way better than Warrior on him as the AOE and extra health are too good to pass up on. More health equals more sheen procs. I know there are a decent amount of other solid junglers, but in all honesty if I pick Hecarim I almost never feel like he doesn't fit in my team comp, or make a big impact on the game.
or
that can get away with building full tank because of their percentage health damage in their kit and junglers like
and
who build some damage they have lock down cc that hecarim lacks to completely lock down squishies to "one-shot" which isn't what his kit is designed to do. And you shouldn't force him to do by building full damage. With his engage he has the be tanky to survive in team fights. Sure he can E into a back line and get to work but he is designed to get in the thick of things, use his W and start Qing (applying armor shred with clever) and being the center of attention while your back line follows up. If the meta favors the more farming jungler or into an assassin meta again hecarim will fit the bill great. til then he's not bad in solo que especially at lower elo but there are better picks at the moment that are more rewarding to play.