The problems are the WSs. If the Meritable WS or the Weapon WS arent good, the weapon will be shit. Look at Ragnarok, Considered shit until Resolution was added... In my opinion the point of those Weapons is to get them for the stats and the aftermath. But the aftermath isnt gonna help you much if you dont/cant use the WS to activate it because its shit. So in that case they should level the playing field and just make Relic/Mythic/Empy (merit WSs not included) of each weapon class doing close to same dmg (not exactly same but close).
For one Rag was always a powerful weapon, Great Sword WS's suck hard core at the time vs Scyth and Great Axe was better then both. The moment a powerful Great Sword WS was created Rag immediately shot to near the top due to it's passive bonus's (OD2.5 and large Crit hit rate increase).

The reason that Ukon crush's Relic GAXE so much is that Upheaval is kinda sh!tt without MS, it's still better then Entropy but not by a large margin. WAR has a large amount of +crit damage that Upheaval should of been a crit WS.

Actually all the merit WS should use their primary stat instead of fSTR, would at least makes things a bit more even then the sloped "STR beats all" we have now.