I don`t see anything wrong using wordpress. It is perfect for blogs or websites explaining ICO idea. Wordpress runs 30% of internet, so it can`t be underestimated as a tool for building good website. Statistics here https://www.codeinwp.com/blog/wordpress-statistics/
Also to my opinion - design should be simple, but fully explaining ICO`s idea. For me more informative in term of ICO reliability would be a minimum viable product.