The Exterminator isn't nearly as excellent as the pilot episode, but much like the previous episode, it's another great entry of the first season. My only quibble is that while the pacing's OK particularly in the first half, the second half did drag a bit. But everything else turned out fine.
The performances still shine and the relationships are still interesting. The script is fine and continues to deliver on the thrills, the comedy, and the drama, the directing is solid and gives a great atmospheric tone to the entire episode, the editing is sharp, the music score's still pretty good, and the climax is really riveting. So, overall, not excellent, but still great episode. :)