I don't think this is true, and don't forget that there's a hell of a lot of CGI in modern movies that you don't even notice. The problem is what they choose to do with CGI, and how they choose to integrate it into the movie: it's far too easy to use it to create completely unreal feeling environments and actions. Freed from the constraints of physical props, it's far too common to create stuff that just looks awful. Meanwhile, too often the CGI team are thrown the already recorded footage and told to make it good in too short a timeframe and too little input. With practical effects they have to work it how before hand and plan the shots around it, with CGI they can film it and hope. Done well, CGI is capable of looking much better than practical effects.
