All I can say is that I, of all the people around the world have to be one of the most sceptic/against these games you have to first buy and then keep paying them the monthly fee. WWIIOL changed it with a bang. Fock ArmA, OFP, BF series and what else you have, if you want a full scale war, WWIIOL is the one to get.
Here's an example of how enjoyable it can be, most of us have played the Silent Hunter series here so you know how enjoyable it is to find a convoy and sink a ship. Now, take WWIIOL. You know the enemy forces are going to hit a town near you hard with infantry and tanks, you take (in my case) Pak38 AT gun, move it to a good spot waaay out of the city to cover a road you suspect the enemy is coming. You wait, wait and wait. Hour and 2 passes when you start to hear the noises produced by enemy tanks, you know there wont be infantry as it's rare to see a infantry to run all the way from the Firebase to the target city (Mobilespawns are for that). You wait for the tanks to pass you, swing the barrel around to aim their butts and let it rip! You can take down whole armored assaults with 1 well placed AT gun.
Or let's the sniper class. A week or 2 ago, I held down half of the enemy AT guns as we attacked a city, I had a very good spot from where I could see the entrance to the enemy AB (armybase). The allies just kept on using the gate that was facing me, so in the end, I got 2 17pndr AT guns, 1 40mm Bofors and whole loads of infantry, helping the German attack quite a bit.
A ******* great game, I tell you!