Are these impulse based or highly interactive ? Because that is the toughest part in PBEM tactical gaming; things like opp fire for example can require a lot of email exchanges if you are not playing in real time.
Don't get me wrong; I like PBEM a lot. Much easier to fit in family and work life. It is actually how I play most of my games but I'm not used to (and don't really need) any animation in those games