Heavy Spoilers from the Alma Torran arc down below, read with caution!
While I don't really mind the concept of a Divine Staff, if we are to continue having them I'd prefer them to be cool like the ACTUAL Divine Staves. AKA allowing the magician(or whoever wields it) to open up their third eye, granting them awesome Alma Torran magic. The Divine Staves we have right now are just watered down and boring. I was undoubtedly wrong when I called them weak in the past. However, I don't think many will disagree with me when I say how boring they are.
In the manga, there were two different types of Divine Staff. The first being what I described in my first post. An incredibly powerful staff in Alma Torran (Which were later destroyed, after some events took place.) that granted both magician's AND mortals intense magic. The second Divine Staff was created by Ugo. There were a total of 72 of these Divine Staves, each created in the image of the original. 72, familiar, no? That's because they would later be known as Metal Vessels. Some stuff happened (not going too far into detail, just to lower the amount of spoilers in my post) and the people wielding these new Staves essentially fused together, creating Djinn. So, it just sort of irks me that Magician's are forced to use a "Divine Staff" even when they are basically just the original form of a metal vessel. The Djinn is still inside of our Divine Staves, but apparently it just works differently.
Balance is an entirely different thing, but considering Magician's are still allowed Dark Metal Vessels...it seems kind of unfair for the good aligned players. We could also remove Magician's from even getting their hands on these things completely, but that is also extremely unfair. I understand that it's canon and they shouldn't have them in the first place, but it's far too late to just take them away from people. Unless we want to rip their hard-worked reward from them.
That's just my take on the entire situation though. If any of my information is invalid, feel free to correct me. However, I'm farely confident that I understand them enough after reading the manga. All in all, I just feel like magician's should be allowed a metal vessel again. ^^