They still do very little damage at 1st and 2nd level, but after that, they really start to deliver good damage. Weapon Specialization for them doesn't provide that much of a bonus, but their trick attack really starts to get effective at 5th level and above. Not sure why it's so weak at low levels, though.
Keep in mind that you cannot combine a Trick Attack with a Full Attack. Trick Attack is its own special Full Action that allows you to take 1 attack. So, you can't get your Trick Attack damage with those 4 attacks you're talking about.
AH ok so you can't trick attack 4 times That is kind of what I was wondering cause that seemed WAY too good. so is the trick attack still better then making 4 regular attacks?
By 13th (the level above 9 we have a creature around for comparison at) it's about equal in damage (possibly slightly lower), but allows you to move and lay down a debuff as well as attack.
So I'd say Trick Attack is better but only by a bit, and mostly due to the debuff.
Do note that at 14th Level, an Operative who hits a target with at least 2 attacks in a full attack can debilitate an enemy like they can with a trick attack.
So, full attacks against a single enemy might be a good idea if you don't have to get through damage reduction or energy resistance. If you do, the one big hit from Trick Attack is probably better.
Which I think is neat. It's nice to have a few different ways to handle foes which are viable in different situations.