I have this game and it's very good. It's single player, no online play unfortunately. But this game puts you in command of either a B-17, or a squadron of 12 B-17s. From there you must manage the bomber and it's crew. You can also change the names of the crew, what they look like, etc.

Not only do you command the B-17, but you can control any of the 10 positions on the bomber. I personally am a true terror when it comes to the tail gunner position. That's where I primarily stay throughout the mission. Then when on the bomb run I switch to the bombardier because the AI bombardier can't drop it in the pickle barrell if his life depended on it.

As squadron commander, you set the primary and secondary targets, you choose which bombers will go on that mission, and their ordinance.

If you aren't one for sitting in a bomber, you can take the role of the "Little Friends" and fly escort in either a P-51, P-47, or P-38.

Want to take out the Allied might? Fly as the German Luftwaffe and strafe the formations in Me-109s, FW-190s, and Me-262s!

There's a LOT more you can do. And it's very realistic. If you want to, you can opt to manually start up all foour engines in the historical procedures (Master switch, cowl flaps, ignition, energize, mesh, etc).

I could go on and on, but you could just check here instead...
http://pc.ign.com/objects/014/014238.html

If you want some in game screen shots, just ask.

P.S. I think, IMO, that the only draw back to this is that you can only fly the B-17G, and I like the F model a lot more. But, none the less, awesome game!!!