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Not to change the subject, but you're very wrong calling the Battle System "unbalanced"...Guardian Forces have many uses other than their abilities...
In the beginning GFs are the best option to use against your enemies and cause tremendous damage to enemies...double the dealt damage in case of using the right element as well as status change in some cases...
For example after reaching high levels and depending on physical attacks, some GFs are still good advantage not only for their abilities (Command, Menu, Character, Party, etc...) but for their use themselves i.e. GF Odin, Gilgamesh, Eden, Phoenix, Cerberus, Carbuncle, Doomtrain etc...
Even with good physical attacks, summoning any GF can be useful...
For example a highly compatible GF can deal equal or more damage than a physical attack ( Very effective against enemies with high Vitality Stat ) depending on the GF's boost...also summoning that GF won't take any time and the GF protects the summoning party member with its HP during that time...
Make sure you don't underestimate your GFs
The Battle System is anything but unbalanced...if you depend only on Limit Breaks then you're the unbalanced one...
Limit Breaks are for critical situations not for every battle...
To stay on subject I already said that I chose Griever...