Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: Do not buy this toy. If you are given this toy as a gift, return it for store credit. This is a flimsly and poorly designed stack of platic and paper. The secret door doesn't work, the elevator doesn't slide and toys get stuck in there. The suggested 10" batman doesn't work with the zip line, bungee or even the elevator. The add says "Using new adhesive technology, you can set up the Batcave on just about any wall" so they want us to glue this thing on to a wall.Please don't buy this toy.
[EX A]: Negative

[EX Q]: I've been a longtime fan of Mercedes and own most of her Valdemar series. So, of course, I picked this book up at my local store. After wrestling through 50 pages, I gave up! I plan to sell it back to my local store ASAP- this is nothing better than a paperweight in my bookshelves. The worst part is, my boyfriend picked it up and tried reading it. Now he thinks that this is a good example of her work!
[EX A]: Negative

[EX Q]: I found the politics of this novel interesting enough to disregard the dated scientific references. Seldon and his science was fascinating to behold, and the plot was masterful. What concerned me was (dare I say it?) the fairly amateurish use of dialogue tags and the fact that each character seemed pretty much to speak with the same voice. Asimov wrote this as one of those authors who are at pains not to repeat 'he said'. So it must be a new tag each time, no matter how ridiculous, often paired with an adverb that makes you cringe: ('spluttered angrily', 'cried sternly', 'mumbled grumpily', so on.) Sad this very basic trick of writing lets down passages of vivid description and intriguing plot.Also, some things seemed implausible to me, such as: how was the foundation, which exported its technology across the galaxy, able to keep its technology secret?Nonetheless, this is a series every sci-fi fan has to read - its attributes outweigh its faults by a fair margin.
[EX A]:
Positive