I am Orsen a sentinal at lvl 50. i am actually dissapointed by all the ppl complaining about sentinal. I soloed my way all the way to 50 through all class quests. only twice did i ask for help from guild members but it was not because a boss was to hard but because i was lagging bad at the time and couldent take care of adds fast enuff, not because sentina could not handle it. Also dont compare sentinal to trooper or bounty hunter. these are classes we all know will be nerfed at somepoint. sentinal if very balanced for what its supposed to do, wich is dps. not take a alot of dmg, or heal. if your haveing trouble soloing, makesure your useing a tank or healer companion. Also they need to be updated on gear just as much as you. Also another reason sometimes yes there are mobs that are a bit more tuff than they should be for there lvl, this is not because sentinal is weak, its because those probly mobs need to be rebalanced. they are not however any of the class quest main bosses as i see alot of ppl complaining. they just requier a certian stratagy. Make sure your useing the right rotations, save "Call on the Force" for those bosses it helps your tank out alot. make sure your companions cooldowns are ready to use aswell. wait till your almost dead, then use "guarded by the force followed by a medpack". Oppertune strike is also amazing to use as dmg, use it after force leap, also useable after our saber throw move. use cauterize and then stasis right after, there are many very powerfull combanations we can use with our ablilatys, figure them out. but most of all our companions are the most powerfull thing we have, make sure they are up to date and dont sweat the classes that are doing a 10x the dmg you are, they are unbalanced and will be nerfed.