Transformers Fanfics, Essays, Author Interviews and More...! Established 1996!
This is what it says on his profile on TFwiki:
"Sludge dumb," is how Grimlock, the Dinobot commander himself, describes the plodding Autobot. The Dinobots have a perhaps undeserved reputation for being dimwitted, but Sludge is the genuine article. He makes the other four look like scholars in comparison.
Harsh, but very true, I bet that in an IQ test a mop and a broom could do better than Sludge.........