What's best . I always had this issue when I work with someone, in the initial weeks I find him/her best and smart but as time goes buy I just see them as avera

What's best . I always had this issue when I work with someone, in the initial weeks I find him/her best and smart but as time goes buy I just see them as average or below average just putting up a facade or may it's me - I just suck at judging people. So the point is best is very misleading thing to look for and very referential