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Ive played alot of mmo's and some of the best times ive had were just with a couple of friends, and i have to wonder, why is there such a stagnant push to always have 5-8 in a group when 3 people is technically far superior in every caregory.
1) Its easier to assemble 3 people than it is for 5-8. This cannot be disputed.
2) Large groups push for specialist classes. The larger the group the bigger requirement you need for specialists.
ill explain: If i have 6 players, every mob is tuned to 6 players. That means they can withstand damage from 6 players and additionally can dish out damage equivilent to 6 players. Thus you either have a model like wow where one player can suck up 6 players worth of damage, and classes to heal 6 players worth of damage.. or you have a model like guild wars two..which has no tanking or healing per say..but everyone has pretty much the same role and its more chaotic...
In either model, if you reduce the group to 3, the requirement for a specialist greatly decreases and the need for utility type players greatly increases ( as there are less people to do more things).
3) More content: with the max 3 man group, you could make the whole game based on the mobs being attacked by 3 players. The easier 3 man content would be soloable and duo-able, and the harder content would still probabally be soloable and duo-able for more skilled players. Thus you have much more content available for all players since you dont really have to focus as much on solo vs group content. This also introduces a natural challenge aspect to soloing and duoing without using any additional resources.
4) Teamwork is far easier with smaller groups. For the average player there will be less headaches, and with a small group things like voice chat are alot more fun.
in an age where mmo's are supposed to be soloable, i cant figure out why they wouldnt at least try to make a mmo with a smaller group size. Its superior in every way.