The problem with the DOT report in the past has been that so much significance is given a report with such a small sampling. For example say HP came in number one in complaints for a particiular month, when in fact only about 23 complaints were filed, and as many as 4 or 5 complaints would be from the same passengers letter! "The flight was late, the agent was rude, my bags were late, and they damaged them". Those kind of letters. Meawhile some carriers, like WN, never get letters. Probably because they keep it simple. It's not hard to meet expectations, when all you promise is quick reliable transportation from point A to point B, and always at a low fare. Meanwhile, the HP pax gods expect perfection at every moment, and they all know the DOT's address.
Better than most, not as good as some.