Let's keep in mind that the only role in the game that is best done by a pure build is a DC caster. You will always get more ranged and melee DPS with a mutt for the same reasons as the tank...you are picking and choosing the best of all 3 classes trees. The only reason casters are sheltered from this is due to spell progression by level and the importance of caster levels...and these have nothing to do with the enhancement trees. This is not a tank specific curse, but rather the optimization that comes when people are allowed to customize their characters...and at it's core is the beauty of DDO.