Since several people seem to believe that PMD root nodes get downvoted more than, say, SoPW root nodes, here is a graph on that point:

"-" = 0.5% of recent PMD root nodes
"|" = 0.5% of recent SoPW root nodes
"+" shows where the "bars" overlap
-95 -
-85
-75
-65 |
-55 +
-45 |
-35 |
-25 +-
-15 +||
 -5 +++++++++++++-------
  5 +++++++++++++++|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 15 ++++++++++++++++++++++++++++++++++++++++++++++++++||||||||||
 25 +++++++++++++++++-----------
 35 +++++++++------------
 45 ++++++--------
 55 ++++----------------
 65 ++-------
 75 +-------
 85 +---
 95 +----
105 +
115 +
125 -

Each "bar" spans 10 reputation values around the labeled value. So the "-15" bar shows the percentage of recent (since node 600,000) SoPW and PMD root nodes that have a reputation between -10 and -19 (the "-5" only covers 9 values, -1 through -9).

The chart shows that PMD root nodes are much more commonly in the +20..+99 reputation range than SoPW nodes. They are also only somewhat more commonly in the -9..-1 range. While SoPW nodes are very much more often in the 0..9 range and only slightly more often in the 10..19 range.

So PMD nodes are more likely to be highly upvoted than SoPW nodes and somewhat more likely to be rather lightly downvoted.

So wherever this "PMDs get heavily downvoted" idea came from, it certainly doesn't appear to be accurate over the last year.