As far as knockback, CC's, and survivability goes, I think that TOR is pretty balanced. Part of what makes bosses fun and interesting is how you handle their abilities. If you're fighting a boss that knocks you around, tank him against a wall. If he has serious stun potential, take an off tank with you. Positioning and threat control are parts of Tanking 101 that make being a tank interesting.
The part of tanking that I am having to adjust to (coming from WoW) is the idea that not everything needs to be tanked. Mobs in instances here are so spread out, that it is difficult to keep them all. Some of the weaker ones, though, can be cc'd or simply burned by the dps. As long as the healer isn't getting constantly interrupted or brutally murdered , it's all gravy.
Tanking in SWTOR takes some practice, no doubt. Just be sure that you are a) managing your defensive cooldowns effectively and b) remembering basic tanking doctrine, you will do just fine.