Every class has some form of crowd control. The sentinel stun is among the weakest in the game because it can be interrupted and the AOE daze is on a one minute cooldown just like Flash Bang. As for "burst," the only spec that offers more burst than steady damage on a sentinel/marauder is Rage/Focus, and Guardians and Juggernauts can use the exact same spec, which offers some large AOE crits but is definitely not the most "bursty" spec or class in the game.
I've said it before and I'll say it again. If you're looking for a class that is second to none on the survivability list, look to shadows. They have a god mode on a 45 second cooldown and can self heal themselves to no end, yet for whatever reason they were the only class to receive no changes in this update.