It's not bad imo. There are some good fights in it like the final one and all the ones that happen when Ichigo gets trapped in the thing that affects his mind. It's also one of the only times where they talk about Ichigo's mom and how her death affected him.
This is probably a bad place to ask about filler though. For many, any filler is bad by default because some guy whose writing talent makes RL Stine seem like Shakespeare didn't write it in a comic book before it was animated.
You can skip over the Amagai arc isn't the worst arc I've ever seen but it isn't perfect either so you can skip. The turn back the pendulum arc which shows all the captains as they were younger is a must see. It's answers alot of important questions about plots and characters in Bleach, like how Kisuke Urahara became a captain and why he no longer lives in the Soul Society. It also explain who the Visored are and how they became who they are. And it hints at how Aizen created the Arrancar.