SPOILERS!
Ant-man's daughter was annoying. Enough with the genius 16-year-old teenage girl designing super cool technology. The trope has been over-used. She redeemed herself a little bit at the end by being a normal teenage girl that had no idea what to do and had no plans.
The mom was annoying too by not explaining anything about Kang. Sure, they were trying to set Kang up as the villain that she was so afraid of that she didn't want to talk about him. But they were already in the quantum realm. Maybe it was time to talk about Kang.
Because Marvel had to introduce Kang as the villain baddie for this phase, no more fun sidekicks in this movie. I was disappointed. The sidekicks were the best part in Ant-man 2. They were funny and smart.
SPOILERS SPOILERS!
The problem with multi-verse was that nobody needed to die. Kang died at the end, but multiple versions of him were alive.
Oh, and how did he die, the almighty Kang that was so powerful? He was killed by very smart ants that somehow developed super technology. Deus ex machina much?