I think PAD is great Star Trek writer (my favorite PAD ST novel is probably The Captain's Daughter, which was just awesome and actually spotlighted Sulu instead of the normal Kirk/Spock/McCoy stuff).
Keep in mind though, to Pocket's surprise, this novel undersold. For whatever reason, supposedly not enough people grabbed this novel off the shelves, even though it was critically acclaimed in most reviews.
Its a good thing this guy didn't get to stay around any longer and do more damage to potential Star Trek novels/tie ins.
"Do more damage" is relative. We have no catalog of all the things he fixed for the better before they went to print, but I know he found lots
of embarrassing glitches that had been missed by others.
Yes, he trod on lots
of creators' toes but, if you talk with RA, he is convinced he was attempting to help them make their Trek stories better.