Don't Install If You're Worried About Problems
If you're having a flawless experience on your current version of iOS and you're concerned about iOS 11.2.2 problems, it might be a good idea to wait a few days before committing.
Apple's iOS 11.2.2 update is a bug fix update, but problems have slipped through the cracks into the final release.
iOS 11.2.2 problems include weird battery drain, issues with first and third-party applications, finicky Bluetooth, problems with Wi-Fi and cellular data, installation issues, lag, and random reboots.
If you're feeling leery, you might want to wait for Apple's next iOS 11 bug fix update to emerge. Apple's confirmed an iOS 11.2.5 update, but it could be a few weeks before it rolls out.
There's currently no way to downgrade to iOS 11.1.2, iOS 11.1.1, iOS 11.1, iOS 11.0.3, iOS 11.0.2, iOS 11.0.1, iOS 11.0, iOS 10.3.3, iOS 10.3, iOS 10.2.1, or iOS 9 so you'll want to be confident in your move to iOS 11.2.2.