Major difference from most other games is simply the complexity of Wargame over many other systems.
LOS is a lot less abstracted than most other games and you don't get fog of war to let you know what you can't see. Terrain, optics, and stealth interact in a way that makes it so that it is difficult to know what areas are properly reconed and what areas are not. You might have a pretty good idea that there isn't a tank in the woods up ahead, but there might be infantry or a small vehicle. If you do not have the appropriate intel, your entire strategic plan is at risk. Do your recon, because...
Getting the first shot off matters a lot more in Wargame than in any other strategy game that I have played. Offensive power scales much more quickly than defensive power, so that exchanges between units is usually quick and decisive. Compared to other games, everything is a glass cannon, and even heavy tanks have minimal 'tanking' ability compared to heavy units from other games. Heavier units do not have more hit points (barring some helicopter/infantry exceptions), they just tend to take less damage when hit. If your tank has been hit 3 or 4 times (and is still alive) it is time to consider getting them out of there. While in other games you can use stealth and terrain to your advantage, in Wargame cover is your first and foremost line of defense. However even if you can see your enemy before they see you...
There is a baffling number of units with similar names, and you will need to learn them in order to be most effective. There will be many names which are foreign or mainly numbers and it will be cognitively demanding to keep them separated. It still confuses me which is the unit I want when I have a Nana-san Shiki next to my Hachi-Kyu Shiki. The soviets alone have 5 flavors of T-62s and T-64s, and 6 different kinds of T-80s and 7 different kinds of T-72s. And they all overlap in terms of combat power. Distinguishing between units takes a lot of practice and you can easily make a costly mistake because of it (after cutting through a number of 55 pt T-72Ms, thinking that your Leopard 2s are not going to have any problem with the 135 pt T-72s). Knowing the features of each unit is important because there is not a rock-paper-scissors balancing strategy and even the best units are only situationally effective. Matching units to the situation is much important than matching unit to unit. I would take a full stack of infantry in a town is a much different beast than a full stack of infantry trying to cross an open field.
Hopefully this is somewhat clarifying