I just got my copy last week and have been reading the rules, as well as setting up the sample of play. Very straightforward, with interesting twists and dynamics. I look forward to playing it.
My first impression is that 4 player will be most fun. Not easy to get four players together... but I noticed that the game structure is very clearly delineated between player turns. You essentially do nothing during the other players' turn - there is no immediate reaction and or decisions (do you commit air support or not?) as we see in other games. Of course I like games that keep you engaged also on other players turns. But Time of Crisis seems like it will move quickly anyway. And more importantly, this game might be ideal for playing asynchronously on Vassal + dropbox.