I loved all three stories in this, but since I picked it up for the Avatar story, that's where most of my focus is going to be.
This story focuses mainly on Ty Lee, with Toph more as a supporting character. I had no idea what to expect, but I loved this story. It has long since been pointed out how Ty Lee joined the Kyoshi after saying she didn't want to be part of a matched set, and this story addresses just that. Also, I loved seeing her and Toph interact as friends, as we never got that in the show.
My biggest complaint is the art. There are some panels I really like (and the first panel is especially beautiful), but the expressions of the characters look a little off in many of the panels. Still, it matches the show's style fairly well, and some of the poses were great.
Overall, I loved it.
As for the other two stories in this, I enjoyed them as well.
With the Plants Vs. Zombies story, it was great to see things from the POV of the Zombies, and I loved how the plants looked.
As for the Bandette story, I had never heard of this one before, but it was a fun read, and the twist at the end was great.