I found Robots of Sherwood enjoyable, personally. It mostly suffers from the comparison of coming right after one of the best Dalek stories since Dalek, and right before Listen. Hard to shine in that position.
Then we got the confused mass of bad plot that was Time Heist (Urrrrgh), the Danny-and-Clara-and-the-Doctor (bad) sitcom that was The Caretaker (Urrrrrrrrrrrrrrrrrrrrgggggggggggghhhh), and the rather silly Kill the Moon (Meh). Mummy on the Orient Express was a vast improvement, but still too tangled in Clara's sitcomish inability to chose between the doctor and Danny and kind of making her look bipolar about the doctor. These elements were in Flatline too, but handled much better, and combined with a very strong story.