If youlike playing Panzer Corps, then you MUST play the "Grand Capaign"s. The '39 GC is a nice opening title for the expansions.
The "-"s: you can't pick you starting core force, written-only briefings.
I enjoyed the campaign. The AI surprised me more than once. I was also pleased with the branching of the campaign;it gave you a choice of where to attack in Poland. Overall, a nice addition to the base game.
Good overall campaign. Play balance favors casual players but can be challenging for vet's trying to minimize losses. The added objectives makes for a more enjoyable campaign since decisive victories are not always about capturing objectives with speed. The equpiment/unit tables could use some adjustment. Early panzer IIIs and IVs should be available at the start of the campaign in small numbers (as in history) to offset the weak panzer I, II, and 38t. Also, the randomized "SE unit" awarded after certain scenarios seems to be bugged.
I recommend the Grand Campaign DLC's to anyone who has enjoyed Panzer General & Panzer Corps. They introduce new battles that are normally not available. Also, they have very interesting briefings that give you some unusual objectives along with intelligence regarding enemy force structure and deployment. Unfortunately, they are only in written form. I love the voice briefings and I hope they can be added later. I like this WWII series because it is more accessable versus some grognard titles.
The play balance is not good enough for playing against AI. You can easily get decisive victory in each scenario even in the hardest level. It is the same in GC '40. Hope it will improve in GC '41.