I am finding the new game is very sensitive to adventuring day length.
If you're having one combat per day, a lot of items seem overpowered. For example, if you have armor that can cast the Shield spell with d6 charges times a day, that's overpowered for a single combat each day because it's effectively just +5 AC for the whole day.
If however you're having at least four combats a day with one short rest, it's fine. You will have high AC when you really want it, but it won't be there for a lot of your turns, and that's fine.