One of the better ones?!?!?! I think it is one of the worst. Sonic sunglasses?!?!?! SONIC SUNGLASSES!?!?!? SONIC SUNGLASSES!!?!?!!
The sunglasses suck. But yeah, easily one of the better ones. The second half of the Lake Ghost story was a let down, but the series has otherwise been great. There are better stories in the first few series, but each one also had several that were just tremendously bad. Series 9 is closer to 5 in quality. So far, only one real stinker (but I prefer Capaldi to Smith by quite a long shot).