Some people have written off BJCP competitions in certain styles, such as saison, brett and sour beers, because the way the BJCP has structured those styles in the new guidelines and the way they are approached for certification makes judging them too inconsistent to make it worth the effort.My own experience for brett/sours/wilds is practically the opposite. I know of quite a few people that are chomping at the bit for the new guidelines since they don't want to just throw their brett, sour, and/or wild ales into 23 due to bad experiences there.
I'm not saying some of the changes aren't an improvement but the new styles bring along a number of problems of their own. Saison is a pretty good example. The new style guideline recognizes that saisons might be all over the place but squeezes them into the same classification where it is highly likely that, like most styles, the biggest or most exotic beer wins. So here we have a style that is incredibly diverse lumped together but then IPA is so splintered that an entrant is free to basically make up an IPA style.
The bigger problem with the BJCP is that these styles tend to be under-taught to judges (see Jim's comments) so much so that many BJCP training courses barely address them and they are barely tested. The stories of horrible judging in these styles are endless. I've personally seen judges say they don't like sour beers and score down sour beers because they just didn't like it (in cat. 23) or give the best scores to the least sour beers in the flight out of personal preferences. It seems too accepted and although these complaints have been raised to BJCP leadership it doesn't seem like they care.