这场辩论被认为太过肤浅，缺乏实质性内容。

The debate was dismissed as too lightweight to address the real issues.

lightweight 由 light（轻的）和 weight（重量）组成，字面意思是"重量轻的"。在这里用作比喻意义，表示"不重要的、肤浅的"，指辩论内容缺乏深度和实质。