I completely agree you can and should make the statement on what you have seen. However, I think we all should take a step back and realize what we see may not be the reality and that statement like "He was really bad", "He was pushed back" or "he got blown up all the time" are pretty general statement and don't show any particular understanding of the position or play. That doesn't mean the point isn't valid, but specifics are what breed confidence in other posters that your knowledge is worth trusting.