I respect your opinion, but disagree. Although it does come down to skill/awareness for the most part, when you're in a raid full of people that can do very very heavy DPS, there is nothing that you can do to hold threat sometimes.
I've MT'ed 8-man/16-man EV/KP and cleared both through Nightmare. For the most part, single target tanking is not an issue, except at the beginning of a fight. We really don't have much in the way of spike/burst threat. Once you pull, your rotation needs to be perfect or you'll lose threat. I actually find that somewhat rewarding as a tank because your rotation is very unforgiving. Missing a Retaliation or not being aware of when Backhand comes off cooldown and rotating it in can sometimes mean you lose threat and DPS pulls.
My biggest complaint though is our aoe-tanking (or lack thereof). Especially compared to the other two tanking classes. Powertechs can DfA once, minimize the game and browse the internet for the rest of the trash pull. Sorcerers have an even better aoe mechanic with deathfield/lacerate, so they get to lolcatsontheinternet, too. Juggernauts get a Smash ability which is on a 12 second cooldown (with talents), and a sweeping strikes ability that is spammable, but does a whopping 500-800 damage and has no threat bonus besides from the overall threat bonus Soresu form provides. So in a nutshell when I'm aoe-tanking I work very similar to the Powertech. I pull, Smash, sweeping strikes until I'm out of focus, Enrage myself, do it again, aoe-taunt and then minimize to browse the internet because at that point I would only be able to get and keep one mob on me.
I think the major problem is that most of us are going into this game from WoW and assume this game is as easy to tank as WoW was post-BC, and DPS assumes they can just go balls deep from the beginning. Is it possible? Yeah. But until BW figures out how they're going to increase threat generation for Juggernauts, a lot of people are going to lose threat and get blamed for it. Nothing is more frustrating than properly rotating your attacks and still losing threat because the threat mechanics can't keep up with the damage mechanics.
And I just want to echo what was posted already that our higher threat generation ability should NOT be on a 1-minute cooldown. I'd propose a 15-second MAX cooldown.
tldr; Juggernaut single target tanking = fine, aoe tanking = lolwut? / Powertech and Sorcerer single target tanking = fine, aoe tanking = lolcatsoninternet