So it seems to me a lot of Hunters don't feel they have an viable alternative role, and that the Trapper of Foes is not a useful trait line. I was just wondering... why? I lead T1 raids in Tower of Orthanc regularly and quite often take yellow traited Hunters as CC classes, and I struggle to see how they are deemed not viable.

First lets consider what they bring to the CC table in comparison to a LM.

Dazes: Both classes have a 30s Daze, on 15s CD at 40m range.
Roots: Both have a 30s root. Huners have a longer cooldown but hits more targets unless the LM traits for it. The Hunter root is also slightly easier to break. There is also cracked earth for LM which is very tricky to use effectivly.
Fear. The hunter has a 20s Fear on a 30s cooldown. LM has a tricky 15s fear on a 1 min cooldown.

So a hunter doesn't seem to be any worse at CC

And the rest. Obviously CC only takes up some of your time. You broadly have buff/debuff and damage. Clearly a LM is better suited to buff/debuffs, but a hunter isn't without their tools, I guess your big thing here is your penetrating shot which get the 4 set bonus. As for damage yes you'll be loosing some, but is it really that much, especially if you have a damage bow, and just switch to your trapper bow for CC.

So yes a LM might be better, but I don't see that a Hunter CC is any less of a viable alternative role than the alternate role of the other classes.

Now hopefully you'll get this far before responding, I'm not arguing your evaluation of your yellow line is wrong, and that you should stop complaining, I'd just like to hear some arguments as to why it is deemed so useless.