I’m the first to admit that some character builds are stupidly powerful. These are usually the result of creative players scouring through character builder and looking for loopholes to exploit. I fall squarely into this camp. My feeling is that if I do my homework and find a really cool and atypical build that gives me an unexpected advantage then I deserve it. But every now and then a build or power gets used in a way that it clearly wasn’t designed for, and after much abuse Wizards steps in and updates the rules. The latest causality to befall this fate is the Daggermaster paragon path.
Earlier this week Wizards of the Coast released a sizable Rules Update (errata) and although it makes a bunch of powers and items clearer, it also closes the exploited loopholes in some build and powers. I know that I have three different LFR characters that need some significant rework following this update.