When you’re involved in a visual design critique (or any critique for that matter) it’s not enough to say “I don’t like this” or “I don’t think this is working.” You have to explain why you don’t like a design or your critique is useless.
While I won’t go as far as saying it’s a requirement, it’s also good to get into the habit of making suggestions to what you think would work. Don’t just complain.
Be part of the solution, not the problem.