That's a shame (that Matrix took that view, I think). But CO2 is way better than CO1, in my humble opinion - more than merely cosmetic differences. The 'cosmetic' differences to the UI are the main thing, of course, but they're so functional that they make a real difference in gameplay. And the engine is free, plus a couple of scenarios (so you can try it and see). It's true though that to get all the CO1 scenarios that were available you would have to pay a bit - but only what you would have had to pay to buy them for CO1 through matrix, if not a bit less. I would strongly recommend the new Westwall pack, which includes really gorgeous maps and some challenging scenarios with a great force mix.
Peter