I got DOD:S but uninstalled it when I got RO!
It's a fun game but I like the slightly more realistic stuff.
The division scrims are always so much fun because you get to meet other clan mates.
I would suggest just training in INS with no scope because that's pretty much how DOD:S is.
Also like any ww2 game, because of the limitations of each weapons class it's best to stick together as a team as much as possible for greater firepower. In Ins every weapon is pretty much balance with exception of rpg,203, and snipers, so it's possible for one guy with a ak to run around and take out 10 guys on a rambo mission; but it's virtual impossible to do that in DOD with any weapon.