WHM aggro generation needs to be looked at

[EaMett]

Enmity management is one of the few things that makes WHM somewhat challenging. If anything I feel they should make it worse and give whm more tools to play around it. Of course extra healing mechanics would be nicer but since they seem to repeatedly screw those up...

In general, grabbing aggro is often the result of non optimized healing (aka you should offload some to your co healer). In pugs this often means that you need to either communicate with your co healer or heal moderately as to not grab aggro and let them "feel" that they need to put more back into it.
Also, I don't care what anyone says but a tank being in tank stance for one single extra enmity combo is not going to break the raid dps. Tank dps optimization is awesome but c'mon, you've got one task. Losing aggro to a healer for your dps is a rough equivalent to a healer letting someone die for their dps. It doesn't matter how poorly they play, suck it up and build an enmity lead (especially in pugs).