Hating him might have nothing to do with it. Neeson is classically trained, and I doubt very much he enjoyed working in front of a blue screen and being told that most of the scenes would be 'done in post'. Take Batman Begins for example. Very little was CGI'd. He was able to flex his acting skills in a real surrounding with the actors directly in front of him.

Alot of actors are particular about how they do films. Rex Harrison refused to redub his musical numbers in My Fair Lady because he had been trained to perform musicals live and felt he did each performance differently. He stood firm and they had to create a hidden mic for him that would be hidden in his collar so that his on set vocals would be recorded.

But this is WAY of topic, so I won't continue any further.