I love my Juggernaut. There's just something about the single lightsaber, heavy armor combo that makes you feel like an implacable, well, juggernaut. And, if they seem lacking now (which they don't in my experience, but I'm only 31) they'll get buffed later. Remember, ACs are essentially classes. So, this is like an entire WoW class being underpowered. That tends to get fixed.
[/COLOR]Every class in the game but marauders and snipers are hybrids. I doubt the long term goal is to have those 2 dominate the other 6 classes.