Does anyone else feel like a lot of the non-standard weapons tend to have too many downsides?
I got an Anna's Bow. Does that really need a stat penalty? The MT is only 8 and it requires a B rank. It's upside is great hit (120) and a luck boost. If the rank was lower I could see the penalty making sense, but by the time someone has B in bows they probably enough skill that 120 hitrate is excessive and want more MT. And luck isn't very good in this game anyway.
Niles' Bow seems useless. Def/Res penalty, only 4 MT (weaker than bronze), can't double, and -10 avoid, and requires C rank. The only upside to it is that it can't KO except at 1HP making it good for weakening a unit so someone else can get the kill, but the MT is so low it's ineffective at doing that - by the time the bow would drop someone to 1HP but not kill, the weaker unit that needs the kill could probably already do the job.
Speed Thunder (which I have plenty of) seems outright suicidal. It's a notch stronger than Fimbulvetr at the same rank, but instead of having a small speed penalty it gives every nearby enemy an even bigger speed boost. Which is dangerous since enemies in this game tend to move in packs. Seems like that would rarely be a better option than just using Fimbulvetr in the first place.
Iago's Tome is has low MT for it's B rank, and trades mag/skl -2 on you for def/res -4 on an opponent. It's like a worse Silver Dagger, for those situations where you really need your caster to pull a stat reduction on a foe?
Beruka's Axe seems a bit better balanced. Great MT and crit + bonus crit damage, but makes you more vulnerable to crits and has a speed penalty. And the stripping weapons are all good E-rank options since they have better MT than bronze without the crit/skill penalties, and a speed bonus on top of that.
Of course, WEXP could be a factor on some of these, but when you are talking B rank weapons it doesn't matter much.