So, I'm tanking a lot and hate the most stressed out situations where you have to mark multiple mobs fast... I've been using raidmobmarker earlier but decided to try MagicMarker (http://wow.curse.com/downloads/wow-addons/details/magic-marker.aspx) but tbh I have little clue how to really make the best use of it!

I got it working kind of, when I press my hotbutton and mouse over it sprays out marks everywhere and I've tried configuring it by setting some marks for certain CC's like sheep etc. but they seem to be wrong for some reason! ok lets give an example!

Heroic Violet Hold:
Sometimes it spawns 4 mobs, 2 casters and 2 noncasters from the portal!
I've set the casters as High priority for tanks and should thus be marked with skull and cross, and then selected the other 2 as High priority CC and marked them for trap, sap and hibernate but for some reason the casters don't get marked correctly anyway. Sometimes it even uses marks that I havn't configured like circle etc.

Does anyone know if there's some kind of wiki or guide on how to use it?

Heading to Naxx-10 tonight and I was planing on maybe using it there, anyone have some hints, tips or even a db for it? 

Documentation is probably one of the largest needs for this addon. I haven't spend a large amount of time on it in WotLK simply because the need for crowd control has been almost non-existant. I expect to spend more time on it in the coming weeks and if not before Ulduar, at least post-Ulduar when marking and crowd control will become important again.