This game will bring you back in time to vietnam for sure.
Gameplay: The AI in vietcong is fairly good. Your squad mates are very smart when it comes to combat and if contact is made they will hold fire and try to get into the best position possible when the shooting actually starts. Enemy ai is fairly smart as well but they will sometimes do weird things like just stand there as they get shot or randomly run out into the open.
It is very easy to die in vietcong also, not just from bullets but from countless booby traps as well. Your pointman will usually point out a booby trap so that you can disarm it but sometimes when your on your own (tunnels mostly) you have to keep an eye out for anything suspicous and trust me, it is VERY easy to look over a trap and not see it because the VC do a good job of hiding them.
Vietcong does a very goodjob of re-creating jungle combat. The area can be wide open jungle sometimes or very narrow paths. You will often find yourself scanning around like crazy looking for any enemies or traps and will also stop and just listen to the jungle for any sounds of footsteps or VC.
Graphics: While vietcong is getting kind of old the graphics themselves are fairly decent. There is an amount of gore to the game as well (you can switch off or tone it down if you have a weak stomach) which will show where someone was shot and in the case of a major explosion, limbs will be blown off as well.
Audio: The music is absolutely awsome 60's rock. Classic music can be heard as you fly into your LZ or while your just sitting in your bunker. Jungle ambience is also very good and sounds exactly like your in a jungle and will even make you pay more attention to noise as you listen for footsteps other then your own (or squad mates). All the weapons have a different and distinctive sound that you will be able to pick up after you've played the game for awhile, the weapon sounds arn't really authentic but they still sound good.
Multiplayer: Vietcong does offer a multiplayer but I haven't tried it out I think the singleplayer is too good not to play but I have heard nothing but good things about the multiplayer so I'd give it a try to see if you would like it.
closing: Vietcong is a different game both in its genre and in vietnam. Unlinke Men of Valor vietcong focuses on the special forces in vietnam and what they had to go through (which if any of these missions truly happened then it was hell). So while there are some points where there are large scale battles it doesn't happen very often and is more of a slower pace "Search and destroy" sort of gameplay then what you would get if you played as a conventional soldier.
I highly suggest you give vietcong a try if you have any interest what so ever in Vietnam or special forces, the story mode is pretty long and very detailed and there is also a quick fight option where you can make your own little battles and jump right in to kill some VC.