Judging the graphical quality of T3 is a tough call, at least in the first section of the game which occurs in the future. When you arrive in the present, the truth becomes painfully clear. The graphics seem jaggy, the textures seem gritty, and most of the characters move like stiff robots. Well, the first part of the game takes place in the future in a post-apocalyptic Los Angeles where humans are fighting machines. So while you have this sense that something isn't quite up to par with these graphics, it's easily written off as appropriate for the setting. The problem is once you reach the present day and begin fighting in parks against human beings, there's not really a vast improvement in graphic quality or animation. Originally the developers wanted the game released around the time of the movie, however they delayed the game several months to ensure quality graphics. Clearly something went horribly wrong.
In contrast, the quality of the sound effects is pretty good. Plenty of machine noises, audio cues, and laser fire keep things interesting. Due to the nature of the graphics, it's frequently hard to discern what's going on, and audio cues will inform you of just what's hiding behind that rafter or up on that catwalk. The music is, for the most part, forgettable, and they don't make enough use of well-known music from the movies.