Dirty fighting can be a bit of a headache, because everyone wants you to go for the blinding sand variant (or whatever you call it). This is incompatible with two weapon fighting or sword and board, and the other ones seem a bit iffy. Not to mention needing all that basin/gear investment to get the relevant skill high enough.
With that said is it ever viable to just not touch dirty fighting and ignore it completely? Or do you think it's too good to ignore as a rogue class feature.