I think it all depends on what kind of game you like. I feel CMBO is more for the gamer than CMBB.
In CMBB, everything works like it is supposed to. Machine guns, artillery, flak guns, and airplanes are now modeled correctly. If you wanted CMBO to be more realistic, you'll love CMBB! If you liked flak guns and SMG squads in CMBO, the pace of CMBB might frustrate you.
Sometimes I miss the simplicity of CMBO. Some of the "gamey" aspects of the game were a lot of fun, sometimes. Still, I adapted my game to the CMBB model and found it much more challenging and fun.
What did you think about the CMBB demo?