First point... yes, absolutely. Most tanks suck. This is true in every MMO, but in this one, especially in the later dungeons, there is less forgiveness for a shitty tank, because most other classes can't absorb damage or park mobs for shit, and your healer has to really think on their toes to keep a group alive if (when) the tank doesn't pick up adds.
Second point, again, yes. There aren't "taunt" abilities as we're used to them from other games. There are enmity abilities, and we spam them as best we can. The problem with the Marauder specifically is this: Our main enmity ability is an AoE attack. This makes it hard to sleep things unless you're able to exclude the sleeping mobs from the cone area, which is doable if you (and the person sleeping mobs) have a brain and some room. Where you can't use the cone attack, you have Flash as a crossover skill, but it's limited in that we don't have much mana. It doesn't use TP. Mana regens slowly in combat. Also, people are stupid and pull mobs off the tank instead of focusing on one mob.
Oh, and TP runs out like *that* when using the cone attack, so you'd better pray your DPS are all on one mob or you're gonna have fun.