Well I play the game and drool over the possibilities if tactics were to be actually employed.
2 or 3 players in a tank co-operating , planning and co-ordinating an attack on an objective with a group of players , a commander and a player working together , the commander plotting co-ordinates for an artillery strike and a player by the radio to call them in. The possibilities are endless.
The harsh realities are that the majority of online players tend to be of the attitude that their personal score , not the team score , is paramount and what defines them a "L33T" player.
Hell even in BF2 , which is also a heavily team oriented game , most are concerned only with their personal scores , not team victories.
These attitudes have been fostered by just about all FPS games out there and since RO:O doesn't reward you that highly for individual kills and quit often the battles aren't frantic close quarters combat, the lone wolf player (which IMO is the largest percentage of online players) soon gets discouraged , bored and moves on.
I don't think ANY FPS that attempts to incorporate any realism will atttract a mass audience online but will definitly appeal to the more mature crowd (attitude..not age) and garner a solid player base , though not necessarily a large one.
Also , quit possibly the majority of RO:O players are older , with families etc.
Come spring/summer the urge to be outdoors and spending time with families over rides their online gaming time so populations decline.
I know this to be my situation.
Hopefully the game will grow in popularity as more and more players hear of it (yep--still lots that don't know anything about RO:O out there other than it exists , they tried the RO mod and didn't like it).
Time will tell.