as far as I'm concerned, most CGI is unconvincing unless it deals with something you cannot recognise as being unconvincing. This is why Jurassic Park still holRAB up well because we've no idea what dinosaurs actually look like so the effects seem believable.
Even with the latest advances in CGI, it is rarely completely convincing. It is used where it is too obvious that people/objects are not moving as they should be, so it takes you out of the film. Its as bad as trying to watch eighties movies where the use of stunt doubles is embarrassingly obvious.
The Sound of Thunder is a hoot for having the cheapest and worst CGI ever committed to a major film. rent the dvd, you'll be amazed how clumsy it is, ruining what might have been a good film.
I was re-watching Romancing the Stone the other day in which a car goes over a waterfall and two people jump out of it at the same time! all for real! stunt people obviously but it was so refreshing to see that again.
Same with Die Hard 2. In that film, a stuntman jumped from a helicopter onto the wing of a 747. Even though you know its not Bruce, you can't help but be impressed that someone actually did that.
bring back the stuntmen and get rid of CGI !!