I was a fan of MASH, and am surprised that it's taken this long for someone to come up with a good show relating to current wars. I'm sure they've taken some creative licensing on the portrayal of the base, life in Afghanistan, and the medicine (as they do for even domestic medical dramas), but a friend who's been deployed to Afghanistan a couple of times-- and is a nurse-- says that it's pretty accurate.
I like that they have developed most of the main characters, they are far from uni-dimensional, they do things we may not like but we learn to understand was right (e.g. the Colonel), they're flawed; in other words, they feel real. The writers have avoided the standard Hollywood drama twists for a change and they have highlighted some of the issues in Afghanistan without getting preachy (both of which were, I feel, Off the Map's fatal errors). They've shown the "bad" guys getting medical care and the deaths of people we've come to care about. There's a nice mix of interpersonal drama along with the cases/situations-- this isn't a procedural, but it's also not a Greys where the medicine's secondary-- so we come to care about the characters. The acting is solid, too.
My after-thought on having just seen the season finale is that it's surprising that they didn't do a scene showing "the highway of heros/people above/the flags flying low" (to quote The Trews song), but then I realized that the show has been respectful of the soldiers they are portraying and that is something that shouldn't be dramatized for a TV character. That they resisted says a lot about the show, doesn't it?
I really hope that Combat Hospital is renewed for another season. Has anyone heard anything? It could be a summer show, like In Plain Sight. Although that feels like an awfully long wait!