Terrible - low resolution, confusing interface, faulty AI
I actually only got as far as the first couple of missions before I gave up out of frustration. In the first mission in Stalingrad, where the objective is to take out an enemy sniper, for some reason my Russian allies sometimes decided to turn on me rather than go for the guy who keeps picking them off. Why? No idea. This had me slapping the mouse down on the table in anger, almost as much as when I got the sniper in my sights but the clumsy no-hot-keys interface had me trying to pick the 'sniper' action to take him out, and get the cursor back to him, before he spots me and takes me out with one bullet. As with the old Commandos games you can get a vision cone for both friendly and enemy NPCs, and watching my allies' fields of view I discovered they were all looking at but ignoring this 'sniper' sitting on a street corner in broad daylight. By the way he can fire MUCH further than your sniper can - not even sure why your guy's called a sniper since he can fire a weapon the sort of distance most people can throw a bread roll.
In the second training mission, in which you're given a spy and a thief to break into the German embassy in London, the guards will shoot you as soon as they see you on the street, even before you've broken into their embassy. The MI5 guys dressed as police, as well as members of the public walking along the pavement, don't blink an eye as they do this, and it just makes the AI feel incredibly prescriptive and basic, and makes for a totally unconvincing game. Later in that training mission I found myself struggling to use the spy's 'distract' ability, which the tutorial reassures me is 'in the interface' - damned if I know where though, cos it sure ain't obvious (you have to right-click on the coat hanger, but nowhere does it say this). If you run while in disguise this breaks cover, at which point you have a mad dash to pick the gun icon to shoot the officer who's spotted you before he takes you down. I only played Commandos 1, not 2, but even then picking abilities seemed a lot faster and keyboard-based - and you could play it at 1024*768.
The maps are outdated. Since they're not in 3D except for interiors (when floors and walls are constantly obscuring your vision, and rotation is done around a clunky single axis), the developers have made them rotatable, insofar as there are 4 pre-rendered views for each map. Swapping between them it's never immediately clear which way you've just rotated it, and it's easy to lose track of where your men are or what exactly you're looking at. There's also a half-second or so delay every time you rotate (and mine's not a low-spec machine), which I imagine would be excruciatingly annoying if you were trying to do something quickly. Also the display panning facility is incredibly bad, pulling the view where it wants you to look, even if that excludes where your men are.
The maps feel much less visually informative than they were in the first game, by which I mean I couldn't work out what obstacles enemies can and can't see you past, and it's often not clear whether or not an area of map is traversable until you actually try traversing it. I honestly can't see why a game that insists on playing at such low resolution couldn't have fully 3d maps, because that would have made the environments make so much more sense. Because of the confusion surrounding map features, a lot of the time your commandos will wander round something straight into the line of fire of the bad guys - intensely annoying.
I've never written a game review before but this game just shocked me so much by how bad it was that I felt compelled to do so. It feels rushed, unfinished, amateurish... the list goes on. I actually wonder if it's the same version that some people have given 8s and 9s out of 10, because I can't see any way that I could get enjoyment out of this.