The combo system is a solid base for what can become a great tool - for both solo and party play. Giving solo combo ability obviously helps solo players to keep damage up without the tp and mp cost. The situation is similar for party play as well; tanks can use WSs to increase enmity and dps can increase damage to keep chains alive etc. Also, though, intuition points to a clear development of cross class combos that will most likely be accompanied with "magic burst" type bonuses - the same idea in place for FFXI. This will most likely be introd with 1.21; seeing as those new classes are to be more defined party roles.

The positioning aspects of certain combos is important as well. Think about when mobs become harder to kill and fights become longer. Combos will be used to attack certain physical features of mobs - necessary to win the fight or get specific drops (speculation at best but this is SE). So the long and the short of it is that the combo system is primitive at the moment; but, looks to be very promising.