What happened in my RQ3 campaign was that some clever adventurers trained a little and then risked dodging against not-so dangerous foes in order to get experience checks.
Then one day, I made the mistake of letting dodge downgrade the success level of the attack. They were complaining that it wasn't fair that a successful dodge wasn't any use against a special attack. It kind of made sense, so I let them houserule that. But then, as they became better and better at dodging, it became increasingly difficult for enemies to hurt them at all. SO, the morale of the story is: never houserule that dodge downgrades the success level of attacks.
When I told one of the players that now dodging was far superior to parrying, he replied: "Perhaps, but think about all the risky effort we've put into getting a high % at dodging... Partying was always the easy way..."