I think all would agree that there are variations in performance, preference, edge quality, shaving, etc between vintage razors. In my limited experience I have not come across a vintage brand that I think is poor. However, IME some I like and think are better than others. I have a few that give acceptable shaves but overall I'm not as impressed with as other razors I have. I won't mention any brand names because I think it could come down to heat treat and hardness or lack thereof of individual razors. So, yes, I have a few razors that I think are "so-so" but none that I would consider to be poor.

Chris L