There really are no problems in this system as some previously stated.
My two hybrid Source Hunters are obviously less capable in specific "classes" skills and abilities then Madora, a pure fighter and Jahan - a pure wizard. Madora is a better fighter then both and Jahan is a better wizard then both.
Scarlet and Roderick make up for it with versatility, but they cannot obtain some higher level spells or equipment, which all have high stat requirements, without seriously hampering their diversity.
(the fact that some very powerful spells and fighting abilities are easily and early available is a separate issue and adjusting that will make the whole deal much better)
The system is good. It just needs smaller adjustments of skills, equipment and specific spells requirements, to become visually and instinctively, intuitively more acceptable to all players.
And also a bit better, improved.
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Talents can remain as they are now, no need to change them except maybe adding more of them, so the choices arent so easy and clear cut as they are now.
For example - "Bigger and Better" really should not be early and easily available Talent as it is now. Because in the game as it is - getting one more attribute point is a huge thing.
And it doesnt even have any kind of drawback at all. You just get an extra point.
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The weapon skills and "Skills" should be upgraded a bit to give some other benefits except just simple incremental % increases. And more then just spell and skill - slots.
Their descriptions should also clearly communicate that talents are very dependent on them, because that will immediately make them look more important then they seem now, at first glance.