played the IA this weekend... while the story isnt that spectacular to my standards, the choices i had to make became more & more, thought provoking as i progressed. i chose the sniper advance class & personally i am more intrigued with the operative after this round. not only does the operative have heals, he has much better synergy with the companion, a semi tanky dps. also, ranged disables do not last as long as the melee variant, thus i oft find myself trying to close in on the enemy.
if i were to choose another class, it'd be the bounty hunter. for some reason, even thought i'm 3 lvls ahead of one, while competing for mob (since no one seem courteous enough to not steal), the BH has higher & more constant burst damage with aoe, allowing the BH to get more of the mob than me. lightsaber wielding classes in the right combination can be faceroll.....
naturally, party forming can be very difficult, unless you are a healer. usually forming a party for one of the difficult quests can take an hour or more. otherwise if u spot others going on the same route/path as you, grouping up instead or stealing mobs is usually/almost certainly the unified mindset.

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