When running Titan I noticed that most people were extremely overgeared (had full DL and some Hero's and garuda/ifrit weapon) and still died much too often. Clearly the gear was there, but they did not have the skill needed to beat it. So the gear will never be enough to get them through Titan.
Personally I feel that skill (knowing enemy rotations/ positioning) is more important than gear. Most bosses will kill in a few hits despite having better gear, so still plays a bigger factor.