Looking at them they're pretty much all personal taste or corner cases.
Well, I did pretty much say exactly that when I responded to the Iconic Familiar.
The overpowered things in Saga are low level characters with skill focus using skills to attack defenses (and using skills like this against non-heroics at high level, but not everyone sees that as a problem) and people stacking the bounty hunter and Gunslinger talents which both move targets down the condition track if you aim. The later is easy to fix by just saying they don't stack, the former is a bit more complicated. Our current GMs answer was to just say you can't take Skill Focus Use The Force until about eighth level, which worked okay, if not great.
Sorry, but gonna drag out a soapbox for a moment regarding Skill Focus...
I see a lot of people (and I do mean
a lot griping about how Skill Focus (Use the Force) completely breaks and ruins the game, yet they seem oddly mum regarding all the other issues that Skill Focus in and of itself causes. Personally, I've seen more damage done with Skill Focus in Deception and Persuasion than I have for Use the Force. Both Deception and Persuasion target Will Defense, which is often one of the crappier Defense scores for most bad guys, and can make it laughably easy to hoodwink NPCs or convince all but the most fanatical opponents to stand down from a fight. Heck, Skill Focus (Persuasion) and Adept/Master Negotiator will let someone literally talk a target into submission. I've heard of more than a few Noble/Crime Lord builds cherry-dipping into Jedi to get those two talents in addition to a tidy boost to their hit points and attack bonus.
Heck, last session of SWSE I played in, I was an astromech droid, and I caused all sorts of issues for the GM's scenario just because I had Skill Focus in both Mechanics and Use Computers. Who needs Force powers when you can lock a bunch of bad guys in a hallway by sealing the blast doors and then changing the access codes to open said doors? Mind whammies are good and all for making stormtroopers think "these aren't the droids you're looking for," but why not just slice the mainframe and change the description of the droids being looked for? And a great way to get that pesky protocol droid out of your wiring to boot.
Can Skill Focus in Use the Force be problematic at low levels? Yes, and I'm not disagreeing. I just think the bigger issue is with just plain old Skill Focus. And Gygax help you if a PC fulfills an Education destiny, since the two bonuses will stack! (At least they nerfed the Fool's Luck/Skill Focus combo, which really got abusive in a hurry.)
Okay, I'm done ranting. *puts soapbox away*