Combat Mission is a great game, but it can be so tiring to play. I've got the first two games, can't play PBEM though because the computer on which I game has no internet connection.

Also, they experience dramatic slowdown on my computer, with big-time mouse and scroll lag, despite the fact that it's hardly weak. Which annoys me.

And of course the lack of a campaign mode is a real tragedy. Single battles or operations just go so far.