Jagged Alliance 2 is one of the absolute best games made ever. 
The basic squad-level tactical combat has not been bettered. I'm replaying Fallout Tactics right now and it is ok, but just not a patch on JA2. The open strategic layer of JA2 (economy, recruitment, quests, city conquests etc) is a wonderful way of hanging the battles together. It is kind of like Total War in that respect - mixing the tactical and strategic levels in a very successful way. And the game just oozes character and atmosphere from the moment you load up your laptop and the screen fades seamlessly into the strategic interface. It is jaw-droppingly good. (And Deidranna can never slap Elliott enough for it not to be funny).
You have done well rescuing Maria - here's some spoilers about what else to do in Kingpin's town:
I guess you have taken the SAM near Drassen to open up the airport so you can buy stuff from Bobby Ray's? It also opens up the helicopter. I recommend travelling by helicopter - it is fast and you can sleep on the way, arriving refreshed for the battle without running into patrols etc. The one bad thing about JA2 is that you actually fight as an "anti-guerilla" - ie I hide out in the towns, protected by militias, and let Deidranna's men patrol the rural areas. In reality, it should be the other way around. To find the helicopter pilot:
What I do next is take the SAM on the west and then the town north of it (Chitzena?). After that, I go back and take out Kingpin. He has a valuable stash of cash - that and the fight winnings will pay for most of your offensive (I recommend Scope). I then head for Cambria, which is a major town with a hospital and quite a few sidequests (talk to people). After that, I go for Alma.
I'd also recommend fighting at night with a team of mainly night ops fighters - it makes the battles much easier.
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