So, About the Dejada...?

[Destil]

I can't think of a Dark Sun weapon that's really unambiguously better than any of the options that appeared in PH or AV.

Gouge. Charge builds want a 2d6 brutal 1 axe and spear. Really the only thing from DS that needs to be nerfed. Charging in general has a huge issue that there's way too many bonuses to stack, and having a weapon that deals as much damage as anything else in the game and lets you stack feats for two weapon groups is too much.

 

[Argyle King]

I can't think of a Dark Sun weapon that's really unambiguously better than any of the options that appeared in PH or AV.

I feel otherwise, but -- being that I'm a player right now and not a DM -- I tend to not complain about it.

IMO, Dark Sun has a few options which tend to be a little better than others. Aside from weapons, there are also some cheesy shenanigans which an Arena Fighter can pull off.

 

[darkdragoon]

It's only 1 more (average) damage than a generic sling. The gouge as mentioned has great stats and counts as two strongly supported weapon types. Wrist razors have also become somewhat popular as a way to carry particular enchantments hands-free.