Graphically WOP is impressive. But the problem is flight model is based on the first IL2 and campaigns are designed based on arcade settings. I have seen myself failing a mission because "It took too long".
It has a simulation component not as deep as CLOD or IL2 1946 but it's there
and you can enjoy it if you don't compare it with CLOD or IL1946.
If you are looking for a new sim try the free version of Rise of Flight. It includes 2 planes (not sure) + multiplayer + quick missions + campaign and once you buy new planes you get the full game which is basically demo + new planes
http://riseofflight.com/en
And the store to buy new planes
http://riseofflight.com/en/store