Generally speaking, there's absolutely no point in creating parties in Besieged or Campaign unless you are a BRD or COR or can get a RDM, BRD, or COR. Any important action, like causing damage, healing, debuffing, and some buffs, can be done outside of a group. More often than not, getting people to join you is a crutch, or a selfish means to make them focus on you, like when melees beg for a healer in Beseiged. A healer's ultimate responsibility in a battle is enabling the goal by maintaining the health of the frontline, who is best to serve this purpose is not always the same person and just like a real medic, one should be allowed, expected to perform triage. Grouping is even less of an issue in Campaign, since there are far fewer people to deal with and people are actually much more willing to heal others, since it contributes to their score. The problem of healing in Campaign isn't the lazy healers, but the fact that the DD/Tank/Healer ratio is usually horrible. DDs tank more than they should, Tanks tank less, and there aren't enough healers to go around. Anyone who cares to do his job, in or out of a PT, will do it if he can, but you can only do so much.
Now, on the subject of working together, if you're actually participating in Besieged or Campaign (i.e. not spamming bar spells, which is a cop out in both), it's impossible not to work together. The problem is people are ridiculously disorganized, selfish, and cowardly. Most people are content to wait at the Fort and allow the NPCs to get railroaded or allow sabotage units to get too close before enough damage can be done to stop them. People pull mobs way too far out and make no mention of it, so when the bulk of a troop is dead, it's more likely that the NPCs wont get the moral boost from being victorious before the next troop comes in and scares them off. In attacks, people rarely try to work with the NPCs as a united front and allow them to slowly die one by one (e.g. in Pashhow, troops always approach from the west, players only attack from the north or east.) Being a party in campaign doesn't make for better strategy, it just gives you tunnel-vision. Good strategy and execution is dependant on the mind of a soldier, not their affiliation.
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