Ok here are my 2 cents on this matter. Anyone who knows me knows I do not hold much respect to any char that relies on hiding or Wof to duel. Reason is simple: This people are too stupid to create a good build so they rely on adding 1 level of SD to help them hit with their rediculous 40-50ab.
To all these people: Try getting better AB! and stop hiding like scared little children and fight like real people.
Same thing goes for Wof. Casted once it's no big deal unless your char doesn't have any spells to remove it, in which case you are basically dead. It's the people who spam it over and over that is uber annoying. These people also do not know how to make a good build which is why WoF is almost exclusively used by noobs.
The solution is to not duel chars that use these tactics. Just abort the duel..I do that all the time.
SoV is not cheap...in fact it's a pretty bad spell and a waste of time to cast.
Dev crit as Raven pointed out is the hardest feat to acquire and pretty easy to avoid if you're not as lazy as I am to add fort.
Hellball used by anything other than a mage is pretty cheesey, thats true, because it can not be avoided.
Anyway there's a lot of garabage dueling tactics out there. But who really cares, since we all know people who rely on them have no honor anyway