Hear, hear. I must admit I'm a bit on the same boat, after wasting a lot of time with CMBO back in 2000-2002 (looks like my old forums account disappeared with some board transition).
It's pretty much just UI issues to me mostly, and most have been mentioned. More clearly seeing who is firing at what, visualizing C&C links better, GRAND UNIT LIST, generally tools to help to visualize what is happening better. I just feel that I could much more intuitively step into CMBO back in the day.
Still, definitely not a ~50 € wasted, hopefully my steelbook hits mailbox back here in Finland this week or the next. Just looking at the mechanics I really like the CMx2 system. Relative spotting is great once I got used to it, non-abstract infantry is absolutely great, with the ability to split proper fire teams and all, and hasn't been problematic for me. It's a robust engine, and many of the UI and clarity issues are solvable. And hey, theres a new PBEM file from my buddy already, better stop writing this...