What difference would it make if you knew a GM was bad? Unless I'm mistaken, you can't say to a GM "I don't want to deal with you, send me another GM instead." I guess you could ask for a superior, but honestly, shouldn't you at least give the person a chance to resolve your issue before you assume they won't? If there is a crappy GM, *not* doing his job, and the complaints pour in through the proper channels, where it can be investigated properly, then that GM would be handled - but some random people posting on a random board somewhere isn't going to help to that end. Heck, your posting accounts aren't even tied to your ingame accounts, how in the world can there be any accountabilty for what *you* post about the GM? All it does is open up a way for the person to, most usually, get unduly trashed.
The fact is, many times GMs are labeled terrible, or not doing their job, when in fact they've done their job. Either you just don't see it, or it didn't meet your expectations, but the chances are quite likely that it was the only thing they could do. For example, an item you lost isn't returned to you - you are upset, you say the GM sucked - when the policy is not to return items, a decision made by EA, not the GM just doing his job as he's only allowed to do so. Another example is this thread here. There is no way to know that the GMs *didn't* look into the scripter - but perhaps he had a sophisticated enough script to answer GMs when they talk to him, or he's got some alert that brings him to the computer as soon as someone shows up, etc etc. The GMs have very strict guidelines on exactly when they can ban for scripting, and they can't deviate outside those lines, even on a *feeling*. They probably get just as frustrated as players do because their hands are so tied. So in this case, the GM, if named, would be needlessly trashed when he almost certainly did his job. It's just not right.
You're fighting the wrong fight here. It's not the GMs that are at fault, it's those that make the desicions on what can and can't be done by the GMs - that's who you need to rail to and against.