Nobody wants to criticise a stranger they will be working alongside for eight weeks, the rubric usually rewards completion rather than usefulness, and most people have never been shown what useful written feedback looks like.
The result is a genre — this was really well written, I liked your point about X, maybe add a bit more detail — that satisfies the requirement and helps nobody. It is not laziness so much as an absence of any model for the alternative.
Three things make a review useful, and none require being harsh. Say what the piece is arguing, in your own words: if you get it wrong, that is the most valuable single sentence the writer will receive. Name the strongest part specifically, so they know what to keep. And identify one place you got lost or unconvinced.
That last one carries almost all the value and it can be phrased entirely without judgment. I lost the thread here is a fact about your reading, not a claim about their competence, and it is precisely the information no writer can generate about their own work.
Most of what comes back will be pleasant and unusable, so mine it for the one thing that is not. Any comment indicating confusion is worth ten compliments, even when you believe the reader simply misread you.
That belief is usually the trap. If a reasonably attentive classmate misread it, a marker at speed may misread it too, and the fix is on your page rather than in their attention. Two people confused at the same point is not a coincidence.
Reviewing other people's work is where you learn to see structural problems, and structural problems are much easier to spot in someone else's writing than your own. Students who take peer review seriously get better at their own drafts faster than those who do not.
And if the course does not provide a genuinely useful reader, that is what buying one does — a read-through against the rubric is the paid version of the thing peer review is supposed to be and usually is not.
Rarely, if it is specific and about the text rather than the person. Saying you lost the thread in a particular paragraph is a description of your reading. Most people are relieved to receive something real, having received nothing but encouragement all term and knowing it was worthless.
It happens and it is not worth a conflict. Take what little is usable, complete your side properly, and find a reader elsewhere — a writing centre, a colleague, or a paid read-through. Reporting a non-contributing reviewer is usually more trouble than it recovers.
Often, indirectly and more than people expect. Diagnosing why somebody else's argument does not land builds exactly the judgment you need for your own drafts, and structural weakness is far easier to see in a text you did not write.
MA, writing. Writes for The Ring on what actually moves marks in this subject, and coaches the students who bring it to us. The rest of the bench.
Tell us the program, the term ahead and where the grade is leaking. A specialist in your field replies with a plan and a quote within two hours. The reading costs nothing, and sometimes the honest answer is that we are the wrong fit.