I've been playing some more Jagged Alliance 2. I used my IT skills to edit the .ini ( no Drassen counter-attack ) and that made the game playable. It still has some problem ( like how often enemies seem to hit and do damage, even at absurd ranges, with peashooters, against good armor ), but I can see why it's a classic.
I read a tip in a strategy guide, that you should only attack locations at night, using stealth. I'm not sure if daytime missions wouldn't work just as well, but it is fun, considering my IMP merc is a complete ninja. I think he has something like 80 kills at this point, while the second best one has something like 20. Because he's the one who hunts down stragglers at night, using his superior stealth, marksmanship, and equipment.