Need new material
So even though it seems like its hit or miss, the show needs some origninality. While having those characters could be original for the first few, when it gets to the 29th episode the material starts to become stale. As a result of this, even when something original does come along, it is thrown to the side along with the material that seems quite rehashed. I would say either make them a bit shorter or focus more on the actual characters and give them some depth so as there is more material to draw on.