The first PG game when it was released was kind of a surprise to gamers. No real advertising or marketing it took off based on game play and word of mouth. It made a huge impression on war gamers and on a young gamer who had never really enjoyed a war game before.
However its hard to repeat greatness and its nearly impossible to make folks even happier with a sequel. Yet this is exactly what SSI did. The game is fuller, better looking and much more enjoyable than the original. When you boil it down this is as good as the PG series got. Other games in the series didnt try to make the game play better they just tried to make the graphics or interface better.
If you only play one PG game it has to be this one