How about I hope they break up and no, I'm not sorry for saying it.
How do you know he isn't going to be a great boyfriend?
You can't know for sure. He doesn't have a stable job and he seems to have problems controlling his anger.
It is bad to wish people problems in their relationship. Breakups are stressful so you shouldn't hope for them.
No, it's fine to think that my friend deserves better.
While it's fine for you to want what's best for your friend. It's wrong to wish that bad on her relationship. Doing this might make you seem jealous of their relationship.