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The Sludge acts as the Monster version of the Armor Knight, sporting extremely high DEF and average ATK. Its downside is that it is the class most vulnerable to Magic (Fire in particular), with the lowest RES Aptitude of creatable classes. As such, sending in against Magic-casters will likely get it killed. Having Firefighter innocents and the Fire Body Evility can help counter its Fire weakness.
To make matters worse, the Sludge's offense is jagged; having no skills above the Power level of D. This makes it only slightly better than a Prinny in terms of raw power. Having a level 100 Alchemist Innocent and the Poison Chance Evility can greatly improve its offense, as a Level 100 Alchemist will give the Sludge a 100% chance to inflict Poison status by a normal attack, while Poison Chance will increase damage to enemies with poison status by 100%.
The specialty of the Sludge lies in its ability to spread the Poison status ailment. The Sludge is one of few classes that specialize in Ailments. (Succubi with Deprave or Mothmen with Sleep are notable examples.)
All of its Evilities (Besides its initial one) are centered around strengthening the poison ailment in one way or another. Using these Evilities tactically will help the Sludge pull its weight in battle, as it's little more than a supporting attacker otherwise.
The Sludge can take a lot of punishment, but it can only dish it out with the right setup.