The phrase "blatant ripoff" means that something was copied or imitated without any effort to hide or disguise it, and it is considered very obvious and unacceptable. Full definition
The monsters shown in the menu look like blatant ripoffs of Charmander and Mudkip and even things like the text seem to be near identical to that used in the actual Pokemon series. (gamingreinvented.com)
The Gnome and KDE Linux desktops for Ubuntu and Fedora at the time were blatant ripoffs of Windows XP for example. (theverge.com)
The movie itself feels as if the writers must really love Stephen King, because it sort of feels like a blatant ripoff of his past works. (fatmovieguy.com)