Volokonovka is perhaps the least interesting of the Graviteam Tactics DLCs, and it's certainly the shortest, but it presents a fairly well balanced, if somewhat straight forward, little campaign.
If you've played any of the other GT DLCs, you should know what you're in for: a new map and campaign, and new strategic and tactical situations to go with them. The landscape here is mostly rolling farmland, interspersed with a few gullies and a village or two. Force pools are relatively small, making this an ideal scenario for a starting player. It's still fun for more advanced players, but I'd recommend getting it on sale if that's your situation--which it probably is.
The general dynamic concerns a superior German force made up mostly of infantry--with a handy mortar platoon included--trying to push east. In the second half of the game the Soviets get to push back with armor, which the Germans aren't very well equiped to fight against, and try to retake what gains the Germans made. It gives the campaign an interesting dynamic with both sides having to balance offence and defence at different points. It's good fun. And being the only WWII summer map aside from the Shilovo DLC, you get a decent change of scenery from the base game.