hello matey nice to see your still wearing your avatar
I've not played it online but here are my thoughts of the single player.
first off No there is on Coop you play alone for the whole game.
Wolfenstein story is nothing new. German nazis messing about with supernatural powers called the black sun. You play as agent
B.J." Blazkowicz and you move around the town of Isenstadt meeting the different resistance fighters and taking on their missions.
You can visit any resistance team you like at any point of the game(gives it a little bit of free roaming feel). If you include all the side missions the game should take upwards of 12hours.
The controls are solid, If you play COD you will feel right at home. The weapons are a lot of fun to use and sound great. There is also the veil weapons you collect throught the game. (veil is the underworld unlocked because of the black sun)
veil powers: veil - it lets you enter the black sun world, same as the one you are in but you can see ememy better and run faster. Also see hidden paths
mire - Lets you slow downtime
sheild - As it says on the tin
Empower - Makes your bullets more powerfull and able to pass through shields
Trophy lovers will love it. There are plenty to be had and they are very well balanced between single player (with lots of items to collect) and multiplayer
Downsides
AI are stupid they will stand there and shoot instead of finding better cover, Which lets you just run and gun. You never seem to run out of bullets and there are veil pots all over. So if you run out while trying to tackle a lot of ememies. you can also find one to re-fill your supply. Removing the tension from the game.
My only advice for the singleplayer is. If you play alot of FPS play it on a high difficulty.