The negative review that was added which was Daily Star which is a British Paper gave it 2/5 and one of the main reasons they gave it that when you read through the review is that "Thor as a character is not as fun the first one and is less fish-out-of-water comedy and he is more quiet and mature"!
Yeah... does this reviewer know that this is the point and this is part of his CHARACTER ARC to be more mature and seeing him grow throughout the films.
But... the reviewer also does have some other valid points that other critics have pointed out such as Malekith being one-note etc.
I really hope that TDW stays in the 80's, but there are still A LOT of reviews left to go from the American Sites because most of the UK reviews are out, so I hope that the US sites give the film 4/5 like most the UK sites.