I've been playing this game and it's brethren for years now and I'm stoked it's on GOG. Sure, the game engine is crude by modern standards and the AI is very predicable but that's part of it's charm. The real value is in it's multiplayer capabilities, scenario editor and massive modding community. Plenty of "what if" scenarios abound or mod one yourself. Ever wondered what would have happened if Britain had fell? If the USSR had joined Germany? The USA alone? Easy to simulate in this game but be warned you will spend hours thinking "just one more turn". Since Matrix/Slithereen have taken ownership of the Strategic Command franchise they have improved it greatly and they still actively support the franchise with tech support and updates, impressive for a 15 year old game.
I won't repeat what other reviewers have already posted about the game. It's maddening at times, suffers fools poorly and will beat you up at EVERY given chance. Documentation is lacking (online guides are absolutely required) and some of the choices in character building are flat-out bewildering. That said, I'm enjoying this game immensely and the replay value is huge. However, the reason for just a three star review is the woefully bad Linux port. Performance on Ubuntu 19.0/ i5-7500/12 GB/GeForce 1050ti is downright pathetic. Numerous crashes (usually when loading a new level which happens frequently) and the combat screen will slow to a crawl if more than 4-5 enemies are drawn, which makes the game almost unplayable. It actually runs better on my ancient i3/Geforce 730 Windows box! Whilst I applaud the devs for making a Linux port in the first place, we deserve batter than this. Sigh...