There is lots of open space to move around on the ground, then there is all of the area that is covered by the buildings and underground passageways. Both of these maps offer a very tough single player, co-op play and adversarial play experience, true gems in level design. The arctic base is also a very well done map, the only thing that knocks it down one notch from the other two maps is that there are not nearly as many directions that you can attack from. The map has two tunnels that join one wide-open area and the base. None of the buildings at the base have any windows to shoot out of which limits the fighting a great deal.
Most fights come from guys peeking out around the buildings or shooting from one of the garages.
Overall I would say that this product is a less then stellar release for the RS series because of the bugs with the training CD and lack of levels to call it an expansion pack. I play co-op more then adversarial so the training maps offer fun short games for us. Also with the small LAN at home hunts between a few guys are pretty fun when you are not in the mood too search the bigger maps for each other. I would rate the product at much higher taking marks off for not joining some of the training maps and lacking some of the polish that it could have had. In addition, the said problems with the training CD have not been fixed at this time of publication.