I follow reviews/wallets constantly and that's not natural. Just two days ago they put out an updated version:

Blockchain – Bitcoin Wallet by Blockchain https://appsto.re/us/9kNzD.i

People do not review that quickly and positively unless they are asked to. In fact, it's human nature that most will only want to speak up if something is wrong.

Something is not right here, especially since blockchain.info is never recommended as a wallet to newcomers.

Edit: For what it's worth, I'm the one who called out the Circle wallet on their review BS, which promptly led to those fake reviews being removed:

"After being bombarded with 1 Star reviews, Circle has added 55+ Five Star reviews in 3 days, with painfully fake reviews."

https://www.reddit.com/r/Bitcoin/comments/5ms1zc/after_being_bombarded_with_1_star_reviews_circle/