Ideal "roles" for a Gigantic team composition?

I would like to know if you all agree with what I consider to be the ideal Gigantic team composition. Keep in mind that I'm not referring to specific characters; instead, I'm talking primarily about roles, such as bruiser / tank / ranged DPS, etc. My ideal comp is below, do you guys agree, or disagree? If you disagree, what roles do you think are ideal?

• Primary front liner (Tank / Bruiser)
• Secondary front liner (Bruiser / Assassin)
• Primary ranged DPS
• Second ranged DPS
• Support (doesn't exactly have to be a healer)