I think the problem lies in you using your taunts. In TOR it looks like you should only use your taunts when you lose aggro, while in some other MMOs a taunt builds up aggro and you can use it every time it is off CD (and hence increasing your aggro).
Anyway... I have not had a lot of issues... also you don't HAVE to tank all the mobs. I usually don't bother with "normal" ones since the DPS slaughters them so fast. Only strong and elites should be tanked. On the strong ones I use cc to keep them out of the fight. Fear, stun and force choke are your friends. Even a nice throw takes them out for a few seconds and a force jumps stuns them for 3 seconds (in my case). Tanking on a Jugg is actually a lot of fun. I was a MT Warrior in WoW for many years and I find the range of skills I have to use a lot more fun in this game. I also seem to have much greater mobility. Also don't forget that some other games have aggro meters, so your dps guys know to stay under tank. In TOR they don't so they need to use their aggro dumps when needed.
In the end TOR is a different game and people need to play correctly. I would not worry about the Juggernaut tank. It is pretty good.