It is important to know that for any project hoping to convince investors into putting their money into the project, they are going to be focused on making the project as appealing as possible which means that the project's whitepaper will surely be good so I believe you should look beyond the projects whitepaper to decide if a project is legit or not.
Always make through research of a project's team, road map and token metrics to decide which projects to invest in
Whitepaper can explain what the project about but not all in the whitepaper is very nice project so if you want to see good project in whitepaper you need also make research to double check if the project is good or not and to avoid scam .