Well I have just tested it and I can sum it up; its pure garbage, stay away from it!
First of all, all the COD games are garbage, we all know that, they are nothing like OFP, ArmA or ArmA 2. On top of that this new black ops game is very buggy, very laggy and is top of the line "dancing & frag" as we know it, I just got dizzy looking the intro before main menu and it was pure horror on the campaign intros. The speed of the game is insane, its like something you could imagine from consoles. Its all scripted and depends on player movement, enemies are spawn out of thin air as you move forward and your AI team mates only move after you move beyond specific point.
The vietnam then...
Well forget about jungle vegetation, I was expecting this and was very anxious to get to play as I wanted to see what VTE is up against, what have the wizards done for the "worlds finest fps game [cod]". Well, there is no jungle, in fact dunno if there is any vegetation other than rocks.
There is two "L3V3LZ!!1" in black ops for vietnam (that I played so far, the story time line suggests there isn't any more as its in Vietnam on 1968 and after that moves to other regions). Khe Sahn and Hue city. Khe Sahn is just a sandy base with some trenches and bunkers with machine gun nests and on top of that, the base is on a hillside. Hordes of NVA attacking the base and T55's in number of 6 in point blank range. F4 Phantoms are "arclight" bomb strikes. Hue city is basically same as any other COD crappy city, there is NOTHING Vietnam about it.
The game play is pure horror. You basically run through the corridor levels with trigger pressed spraying bullets all around hoping you survive. Oh and they have Hecker & Koch MP5-K sub machine guns in 1960's... On Hue city the air strikes come from Huey gunship which suddenly shows up in middle of the streets between the buildings and strafes with miniguns the T55 tanks for example, its so lame I cannot express it with words.
If you are considering checking out COD: Black Ops for the sake of it having some Vietnam era stuff, oh please God DON'T!
