Well for one you can't compare WWIIOL to any of the Battlefield games, or Call of Duty, or Joint Opeations or any of those games. It's its own unique game unlike any other game out there. For one, you don't play on "maps" like you do in the other games. This is one huge campagin, with tons of towns you can attack/defend. Your sides "High Command" places attack and defend objectives on certain towns. When you attack a town, you must capture certain buildings in it, and some of the buildings will let you spawn in infantry INSIDE the town (called depot spawning). As you can guess the depots that allow theses always have tons of action around them. But you dont have to be just a rifleman. SMG's, engineers (called "sappers" more often), machine gunners, anti-tank rifles, and grenadiers (they carry rifle grenades) along with the plain riflemen. You can be a fairly large amount of tanks (not spawn them all at once, I mean there are lots of tanks you can choose from) all of which are extremely fun and realistic to command, unlike Battlefield games. Oh yes and there is a ranking system. As you complete more and more missions, you go up in the ranks. The higher the rank, the better things you can spawn. And there are ranks for the three branches of the military. You can also be fighter planes, dive bombers, light bombers, heavy bombers, boats, anti-aircraft guns, anti-tank guns, trucks, and lots of things like that.
There is also a research system. The more research "points" your side collects (by keeping your factories undamaged) the more things you can put in your spawnlists and the better items you can research. You can take down the enemys factories by getting in a bomber and doing some bombing over the enemy city.
To even try to compare it to Battlefield or DOD or COD wouldn't work. WWIIOL is its own unique thing, unlike any other game. (and no, before someone asks, you can't compare it to Planetside either! Planetside is like tribes with a monthly fee)
