Now I haven't played a glad tank, but I have as a mara. It's really not that hard to be honest. Keybind the 1 2 and 3 signs and you're pretty fine. The pulls I had issues with were the ones I didn't mark at least number 1. Because the Thama and the lancer would attack different targets because I didn't tell them which one to attack.
I think I was a bit under geared to be honest but the conj did awesome job and nobody died.Though from what I can see, glads generate less threat but are a bit more stocky and mara's do more threat but are a bit squishier.
