A lot of really good-looking stuff in this episode; from the beautiful backgrounds to the Shishos' transformation sequence to the fight against the (very cool) dragon, this episode is visually among the series' best. Sadly, while the rest doesn't look horrible by any means, it never reaches the bar set by this beaut.
Random thoughts:
It's funny how...different the Ninja Tribunal's designs are, after the relative deritativeness of the acolytes'; I wonder if that was in any way intentional? I also wonder when it was decided that the Tribunal would have designs outside the Shredder armor--was it when the group was first conceptualized back in season 4, or was it decided during the design phase of season 5 proper? In any case, they're damn cool--I really like how they incorporate the upside-down Foot sign--I didn't notice Chikara's until today.
Character details like this is what's always set the show appart for me: little details such as how their Superman analogue is a black man, the Ultimate Ninja has an unexplained metal hand, the old married couple in the second Nobody episode is interracial, and that Faraji uses a katana. Hell, Hun in himself is pretty damn cliche-busting. But yeah, this is a very nice detail--plus, it explains why you don't see Hisomi with the other three Shisho's in the Master Yoshi episode--he's being stealthy

. And it's also appropriate, since "Chikara" is Japanese for "strengh".
Just in case you were wondering: The "shisho" heard after every one of the Tribunal members' names is a title and not a surname; it means "Master".
Two episodes in, and the turtles have yet to question the upside-down Foot symbol. Even they're incredibly dense and haven't noticed yet, or they've realized that it's pretty much irrelevant at this juncture.