Really, out of any Devourer junglers, and junglers in general, Yi is easily near the bottom of my list. Complete lack of CC (where even Shyvana has a frequently available knockup with her ult), and it's so easy to just have one or two people build a Thornmail and Ninja Tabi.
Vi has two knockups, including a targeted AoE knockup, %armor penetration and %HP damage, plus the shield from her passive to give her additional tankiness.
Shyvana has %HP magic damage that accompanies her already-high physical damage, and Burnout is on a lower cooldown than Alpha Strike. She's also probably the most reliable champion I've ever used to solo dragon, and I've done it with every Devourer jungler the moment I get Devourer, if not even before then.
Jax has his leap, total autoattack dodging ability, an armor/MR steroid that gets stronger the more damage he has, insane mixed damage, and an AoE stun.
Xin Zhao has innate healing on his basic attacks, a slow on his targeted dash, knockup and AoE knockback.
Yi does not have any of this outside of the blink from Alpha Strike. He has combination healing and damage reduction; it's stopped by any hard CC or a source of true damage, both of which many mid laners have in their kits and Ignite, and most top laners and supports have plenty of CC, too. So do plenty of junglers. Alpha Strike can dodge things, but if he doesn't use it well it very easily backfires on him. He has no true safety features over other junglers.