1. He was often dismissed as a mere criticaster, lacking in depth and understanding.
他常被视为一个纯粹的吹毛求疵者，缺乏深度和理解力。

2. The article was written by a criticaster who clearly didn't have a good understanding of the subject matter.
这篇文章是由一个明显对该课题了解不深的不成熟评论家所写。