New question from a comment on Is this Dex/Int build Viable for a PVP arena playing primarily vs Glass-Cannon Casters
Dex based characters are, of course, generally no good.
Using a goblin as a base (+4 Dex, -2 Str, -2 Cha), at level 5 I can easily have 19 TAC/AC, and increase from there depending on class/skills. Assuming a level 5 caster with 18 Dex using a Scorching Ray (1d20+6), this means they'll need to roll at least 13 to hit.
Utilising either ranged weapons, or a Scimitar with the Dancing Dervish feat, why wouldn't a Dex-high char be viable?