Well that is effectivity for you, cause there are many other factors to be considered that is not yet researched because of the limited amount of time. Nonetheless, as Tabas said, Even if you caught Covid after having the vaccine, the effects can't be worse, and it is like a regulard cold even though it is covid. And pretty much you won't even feel sick or tired or even loss your taste.
Yes, at least you'll have a better feeling than not getting the vaccine.
they dont have complete protection from getting the virus but even in the cases that a vaccinated individual gets the virus they're likely to be extremely better off.
You'll have the protection because you took the vaccine and it will minimize the effect that it usually give to the infected people.