It's not a fucking fatigue bar. It doesn't even need a visual indication whatsoever. The fatigue effect just diminishes your swing speed with each consecutive swing, and if you stop swinging for a sec or two, you can swing as fast as before. It's just to stop guys like krampe who have absolutely no blocking capability, but still top the charts.
You can try to compare it to WoW or other stepped logic games as much as you want, it doesn't change the fact that it's something completely different. And it would work. M&B would be a better game with it. Of course, you are free to have a different opinion.
this will just encourage camping and hiding
Why? You still have to win the game to increase your multiplier. If reducing spam leads to hiding and camping, then this mod has serious problems. But I think you are wrong in your predictions...there are a lot of players that CAN block.