Outlook not opening? Sounds like Microsoft didn't do their homework and didn't get ready for the new OS with the betas. I feel your pain, but this one's not necessarily an Apple problem.
The rounded corners aren't a favorite with many people, although some people don't seem to mind, as evidenced by the threads of this forum. Please complain to Apple—they have a feedback form.
You can easily change the wallpaper, so no need to complain about that. I don't find the default wallpaper so great, either, but that's why users are given settings to change things. You have options.
As for the notch, that's not an OS problem—it's a hardware matter. It shouldn't affect your daily use of the machine. I'm not sure why you are complaining about ports, either.
When it comes to tech stuff, there are things you can change, things you can learn to live with, and things you can complain about to the manufacturer. Of course, you can gripe about it here, and you'll find company—there are plenty of people who are very vocal about the new OS. It won't help your situation, though. Good luck.