I would still say it's trydamere, by value of his ulti alone. melee dps has a habit of getting focused down first, Tyrd's ulti let's him take the dmg and ignore death for 6 seconds, He's got the highest chance of surviving a team battle if it goes wrong. Shaco with deceive and flash, is also good at getting away, but he can't spend as much time in the mix.
That being said, Shaco is still very good cause he can go from behind and knock out their ranged carries.
So it's up to your personal play style. Yi is decent, but any team worth their salt will focus him, and now since they seperated blind into miss change and movement debuff, his OPness of highlander is reduced a bit. I'd vote shaco and tryd as top viable high elo melee dps.
Oh yeah, Jax is pretty good at well, but he's got a glarying weakness of being squishy, so casters can destroy him fast. His dodge is also easily negated by divine sword. So being squishy, and having his defense totally negated by an item = not so good. Viable, but not the better choice.