I actually didn't use mud much, but I imagine it's pretty good against kote/kanse if you remove the right pieces of armor.
Warpaint gives around +35 morale if you take off all your gear, and then you just put it back on. It has some kind of demoralizing affect.
Savage blow does anywhere from demols to caps devastates, it's based on size mostly, give trip lag and can't be avoided with protective shield.
Brutal rush sucks with giants, so I don't know.
Improvise weapon sucks.
Rebounding strike is pretty nice, about as sucessful as riposte.
Cavernfall is okay but not great.
Shadowstride is very very nice, low dex or not. You can avoid nearly everything almost everytime.
Smokescreen basically gives the smoke affect, with about (I think) Dismembers damage.
Protection from metals is enough to cover iron/mithril vuln.