This is a more in depth explanation of why I delete pages under WP:CSD#G11, "exclusively promotional", in addition to them just plain reading like an advertisement. Caveat lector. I have the highest threshold for honoring speedy deletions of anyone I know. There are no guarantees that following this advice will avoid deletion. The best advice I can give is avoid laudatory adverbs and adjectives.
First, a word about sourcing. (See WP:V and WP:RS.) Information in an encyclopedia must be from reliable sources, unconnected with the subject, and with a reputation for fact checking. Someone must have written a great deal about a subject in depth and must have verified the accuracy of what they wrote. For the most part, that means major media outlets-- books, magazines and newspaper, in print and online. For the purposes of avoiding a promotional tone, add the criterion "objectively". One would think that a review that calls a product the best thing ever would assert notability. In an encyclopedia, it just comes off as promotional.
Now some examples of content that provokes a visceral response in me or might otherwise qualify for G11. These should be avoided to maintain a neutral tone. The presence or absence of the following is not a litmus test for meeting WP:CSD#G11. It is the overall tenor of a page that must be considered.