The doorway page comes under the black hat SEO trick to make fool the search engine to boost website rank in quickest way. Doorway pages are specifically to draw search engine visitor to the website without telling the users. These pages are the standalone pages just increase the visitors to your webpage. But due to regular improvement in Google algorithms the doorway page technique is not much effective as it is before. Generally SEO companies should avoid these types of tricks to get penalized in Google Search engine.
Some Of the Demerits of using Doorway pages for your website:
-No benefit to the users.
- full of stuffed keywords and do not offer much information.
-Search engines may penalize your website
-Risk of being removed from Google index.