Dissertation nearly there

I've been checking my work against the marking scheme. I reckon it passes, but I can't tell the quality of the pass; I don't think it's a distinction. How can you assess yourself against clearness? What is clear to me has not been clear to my supervisors. The marking scheme for a band that is 84-70% wants

"clear articulation of research questions that are derived from a critical review of the literature."

I can find problems with that - what's "clear"? What's "critical"? and have my questions come from the literature? Do I show that they have, or do they seem to come from the top of my head!