That picture shows what my issue was with them in the mud. They don't clear. Even when I spun up the wheels this Alabama mud was too sticky to clear out. Well said in that is all depends on what terrain you anticipate using them in.
I can see how you would have trouble with an All terrain if you spend much time in the Alabama mud. All Terrains will gum up and hold sticky mud no one can argue against that. Their tread voids are just not wide enough for thick mud. Shoot, even the best of MT's can hold the sticky stuff your talking about. In the mud I was in, even though it gummed up there was still enough bite for me to go anywhere I wanted to go. If I spun the tires they'd throw mud everywhere but not all of it would clear from the tires. You can see in the picture above the tires were practically having a mud fight with my jeep, I'm not sure who was winning. I even had mud all over the very top of my hardtop. I felt sorry for anyone driving behind me for the next two days. Even after hosing everything down I was still loosing mud while driving down the road.
If you like spending time in the mud, no all terrain will be a good tire for you, an MT or a very aggressive All terrain would be a better bet. For moderate mud this tire can certainly hold its own.
Check this out. Here's a few more good pictures of different tires in mud. These are all from the JK Experience 2010 event. In this muddy lake bed almost every tire out there at one point got stuck. I was riding with Falken in their JK at the time with a set of 37" Wild peaks we were one of the lucky ones that did not get stuck in this mud. (clever driving, lots of skinny pedal). We certainly could have got stuck though, any tire could have got stuck in this sticky lake bed.
42" MTR with Kevlar (correction, These are 42's!)
Here's a set of 37" wild peaks after driving in the same mud in JKX2010
Here a set of stuck 37" wild peaks
Here's a set of BFG Krawlers trying to find the bottom