Yes, the episode was a bit "Meh", the nasty alien as a god is a very heavily used meme in SF, and they didn't even use it terribly originally or well. The "solution" was vague and wishy washy, being more an excuse to let them throw in some stuff relating to Clara's childhood, and how much she loved her mother. Bring back Donna Noble (who I really liked), and her irascible mother, who I didn't like much as a character, but was probably more realistic of many people's relationship with their parents.
It wasn't a bad episode, but it quite clearly wasn't up there at the top either. Many of the characters were very flat, and lacked any attempt to flesh them out, probably because there were lots of relatively minor ones. The Vigil had good potential as baddies, but defeated by the Doctor rather easily in the end.
6/10 I'd say.