List of Jax bugs/Qol fixes that are necessary
-Counter for his ult proc to showup as a stacking buff like his passive does -Counter strike has no consistency at all, it dodges skills but then doesn't dodge completely skills that should behave the same. I have a paragraph about this underneath the rest of my bugs because this one's a mess. -Terrible delay on autoattack, especially when he's proccing R: the sound effect occurs before the damage does -Spell Vamp on Jax's ultimate is very buggy when you're killing minions/monsters; half the time it benefits from spellvamp, the other times it doesn't. This can be easily recreated by getting a revolver and killing minions with the ultimate proc and not seeing your health increase in a burst. -Jax's ultimate aura disappears as soon as it's activated instead of staying around for the full 8 seconds. This is very easily recreatable and happens 100% of the time, just press R
Now back to Jax's counterstrike, For example, Jax E will dodge the entirety of Ezreal Q and Gangplank Q, but will not dodge the entirety of Nasus's Q, just the attack damage portion. This makes no sense, all 3 skills behave similarly, they all do 100% physical damage and benefit from lifesteal. Another example of this is comparing Irelia's W and Kog's W. Irelia's entire W autos will be dodged, while Kog's W will go through but the basic attack portion will be dodged. Lolwiki says otherwise; this is a lie, I just tested it in a custom. This makes no sense at all, as the two skills literally behave the exact same way. Both are on hit effects. Now if you want to argue that magic damage on hits should be dodged but not true damage on hits, Warwick's passive IS dodged. So yea, fix this please.
And those are the big ones I can think of, there's a few more I'm missing but they aren't anything huge.
By the way, everything I listed can be tested in a custom in under 10 minutes. If you don't believe me, go try it yourself. Jax is one of LoL's most bugged champions.