I disagree, i find XIIIs combat system to be boring and repetitive.
I do not like the fact that i only control 1 character, i dont like the fact that if the leader dies the rest automatically dies, i dont like the class system.
Basically i find the AI of your partymembers to be too retarded, deciding to cast esuna to get rid of slow instead of healing the guy at 5% health, and when i go control the medic myself, the other members usually use questionable spells/abilities.
i agree with those who mentioned the combat system of the Grandia games, now that is a system that works and is fun.
oh and btw, i have beaten FF13 so don't come saying i haven't played it enough.