Being a lone wolf is almost as much fun and working with 5-10 guys taking an objective. Of course you won't be anywhere near the top of the scores if you don't work as a team and take objectives together (10 points for a capture as opposed to only one for a kill), you'll still have plenty of fun. You could snipe (plenty of open maps), or you could setup a machine gun and just fire away (provided you aren't being a hinderance to your team)
Now comparing it to BF2 in terms of trying to win a round by yourself, its not going to happen. If I remember correctly, BF2 flags (which don't exist in RO) can be taken (and rather rapidly) but one man. In RO you wouldn't live long enough to capture something on your own. Take StalingradKessel for example, the middle warehouse is massive, and having just one enemy in the capture zone will nullify your ability to capture it. So teamwork is key on RO.
edit: to add to your point about being on a team that is not cooperating. That would almost be a lost cause, unless the enemy is doing the same. If everyone on your team is doing their own thing, chances are the round will be over pretty dam fast.