Mackenzie's outfit would have been cute on a young woman at Comic-con. On a preteen, it was way too mature. Or, to quote Season 1, it was sleazy. Those ruffled panty/short things do not belong on anyone under 18.
I liked her dance the best, though I will admit to not knowing enough about dance to know if it was really hip hop. No more pigtails and cartwheels, though, so it's a win for her! She was passionate and strong.
Brynn looked like a noodle. She's all limp arms and legs, and her face is worse then Kendalls. Technique doesn't matter if you put the audience to sleep.
Jojo was cute, but not particularly memorable this week.
The costumes for the group were hideous. These are all lovely, slender, strong girls, and it made them look chunky. It was a nice dance, though.