Stretching the blob to allow for massive battles

[Diggles]

Friendly Fire
Slower paced combat without the ability to flee easily (without dying)
No overpowered stealth classes
spread out group objectives

One reason why people huddle together is protection from gankers - stealth classes, overpowered classes and players much higher lvl in skill.

If you have game where a lvl 40 stealther cant instagib a lvl 20, and 3 lvl 20's can take out a lvl 40...you have a more interesting game. If it takes that lvl 40 2 minutes to kill a lvl 20...by then several more people could come to help out.

another would be more defensive classes. the intercept/guard ability that shield users in DAOC had where they could take hits from a chosen target and abilities like shield wall in Warhammer were great.

the ability to turtle down and shrug off a hit is important. the downside needs to be it takes awhile to get into formation to do this and you are exposed to positional damage. So if some rogue shows up behind me and stabs me, I take alot more damage. If I break ranks then the guys around me lose defensive bonuses and all the AOE hitting us then decimates the formation.