SAGA is a very solid system and the amount of overpowered or unbalanced stuff you can construct is rather limited.
The one consistent thing that needs addressing is the Condition Track, since it's fairly easy to abuse it.
But it is overall balanced. I do think it is the best system out of 3.5/SAGA/4th.
There was some drawbacks with the old system as well, one in particular I know of:
Xexto Jedi using the Lightsaber form that allows you to use Dex instead of Str on anything that matters (type III I believe). Able to solo a rancor at 4-5th level without breaking a sweat. It does have 4 arms after all. Friend of mine did this, the DM was not amused that his "scary monster you need to run away from" died.
Anyway, I shouldn't stray too far of topic and since I've never even read a single word in any Pathfinder-related publication, I have nothing more to say.