Personally I don't play the quick battles at all, so it is all campaigns and scenarios for me. I played one so far, with Brazilians, which I found good. I had short looks at the briefings and maps of some others and there seems to be a good variety of different setups with some really interesting and extreme terrain. So all in all I would give a thumbs up. That being said, it feels like the modul maybe would have needed one more "thing" in it to really round it out. Sure, there are lots of new nations in it, but many feel like variations on what is already there. Realistic of course and not a huge deal, but because of that one wonders if maybe having the RSI in, or the FSSF, or the aforementioned French variants would have made it feel a bit more of a slam dunk. Another aspect is that in many ways, if feels a bit like the "star battles" Anzio and Monte Cassino had been covered in Gustav Line. This is probably unfair, but it certainly feels like you are playing in more of a "backwater" after June 44, with fewer big standouts. On the other hand, that also means you will learn more about an underappreciated part of the war, so I can go both ways on this.
One thing I haven't noticed so far by the way are the infamous "version 4" AI misadventures. I had never bought one of these upgrades before, but it seems like in this version whatever bugs there were were largely fixed.