To me cg is more of a tool to help punctuage effects in a movie. But shouldn't be the main source of special effects in a movie. Jurassic Park to this day used it the best. Kept mostof the cg effects in darkly lit areas or in the rain. Looked and felt real.
Take that and compare it to I Am Legend. A movie helped not at all by TERRIBLE CGI when makeup'd and costumed performers could've been so much better.
Am I the only one that didn't think the Alien suite looked terrible in alien? I realize it was a guy in a suit, but I wasn't thinking during the movie, "man, thats a guy in a suit," when I watched it.
On the flipside, movies that overuse CGI only take me out of the picture.
I am Legend is a prime example. I'm happy that practical effects were used for the LOTR trilogy for the most part. I remember groaning in the theater during the prologue to Fellowship. As opposed to being blown away at the films final battle with saruman's orcs.
The same for the Matrix as oppossed to its sequels, where the overuse of CGI became apparant and distracting. Especially when they used it for absolutely no reason. Why do you need slo mo punching in the face of agent smith in cgi? You have normal actors that can do he same action.
CG is a tool. Its just not the only tool. For the whole, I vastly prefer robotics and suited performers.