Alternate Character Interpretation: Hela states that Loki will not remain in her realm forever because "he is (her) father". This could be interpreted as: 1) she knows that how cunning and mischievous (her father) Loki is he will inevitably escape, or 2) Hela may release him eventually because he is her father. Though given their antagonistic relationship it may be the former.
The Scrappy: This version of the Hulk is very unpopular due to being stupidly overpowered.
They Wasted a Perfectly Good Plot: As the CMOA states, despite the film supposedly being about Hulk fighting Thor, all the fighting consists of Hulk Curbstomping everything, rather than being about a huge fight between the two of them.