I love CGI, until they do too much with it. I Am Legend would've been a great film if they had used real people. It is a special effect, and should be used as such. Most FX films had a lot of real elements with little CGI. The Prequels had a lot of CGI, with few real elements.

I just don't think we are quite "there yet" when it comes to realistic CGI in Live Action films. The best CGI I have seen just looked "Less fake".

Jurassic Park still holds up well all these years later. You notice the CGI, but it's so far in the background, that it works.

Spielberg is from the old school years of "Sleight of Hand" techniques in FX. George used to be as well, but he was too confident in CGI. CGI would've worked just fine if it had been used sparingly. TPM has aged the best of the PT, simply because it uses CGI the least.