You have to take into account how much was already decided upon before Ratner even entered the equation. The pacing was quick, but how much did Penn and Kinberge really give him to work with, especially when Ratner had to start film as soon as he was picked to direct. A director needs to be involved with a film from pre-production, if not sooner. The studio was ready to shoot with Vaughn, meaning sets were already built, visualization of the effects was underway, etc. Ratner's not Spielberg, and that's not a knock at Ratner, few people are Spielberg, that's just a scientific fact. Granted, Spielberg would have made X3 great UNTIL the last five minutes, when his super mega-happy ending would have unraveled everything that preceeded it.