I agree with the OP, more tanks (defenders) is better and so is more leaders and controllers too. While it doesn't totally fit 4e, I was hoping for a role switching mechanic similar to Champions Online so you don't see a bunch of strikers standing outside dungeons yelling "Need a <insert defender, leader, or controller…
My dream list of classes would include a balanced list of roles and power sources. Roles: Controller, Defender, Leader, Striker Sources: Arcane, Divine, Martial, Primal Classes Controllers: Wizard, Invoker, Hunter*, Druid Defenders: Swordmage, Paladin, Fighter, Warden Leaders: Bard, Cleric, Warlord, Shaman Strikers:…