To be fair, pretty much every huge budget action film uses a ton of CGI these days. I don't hear too many people complaining about all the CGI in any of the Marvel movies. It would be interesting to see what the prequels would look like with today's level of technology with effects.
True and in many cases it isn't good, in others its pretty seamless.
Problem with the Prequels is literally EVERY shot was done with pure CGI, nearly everything is on a green screen set. Very little of the movies were shot on a location. Very few shots had the actors actually interacting with something, and it REALLY shows. It is a very sterile and lifeless environment, something that is so NOT Star Wars when you look at the original movies.
Of course this is just but one of the MANY sins those movies committed that starts on a preproduction and writing level.
Anyone on the topic of CGI. There is definitely some bias against it, because when its overused or used poorly it is really noticeable and sucks a lot. Thing is majority of productions use some level of CGI to add to various scenes and shots and when done well no one complains because no one really notices.
An example from something very popular is the Battle of Hardhome from Game of Thrones. Was one of the most critically hailed scenes from the latest season and was done with a mix of actual physical effects on an actual set, and CGI mixed in.
Basically people want to be entertained, and be transported to the world of the story, but no matter what the suspension of disbelief still holds true today as it ever has. An audience will only suspend their disbelief for so long. It isn't just for plot and characterizations, but also for what they physically see.