Smaller ship lists also have less attacks per turn, making C3PO much more effective.
I'm not sure what you mean by this. A 4-5 rebel list, or 6-7 Imperial list has less attacks per turn then what?
C-3PO provides at best 1 extra evade result per round. Which is handy, and likely worth the 3 points, but it's still only going to stop 1 hit per round. When you're throwing 12-16 dice, that one evade isn't exactly amazing.
Worst part is that there really isn't too much you can do to compensate strategically; falcon will always have a shot.
That's why action denial is big against the YT, because without an action the odds of a successful attack go down quite a bit. Which means the best flown YT's are not easy mode, because you have to avoid the other ships on the table.
People bring up that you're paying a lot for three attack dice, but this is a simplification.
The system the whole game is balanced around is a simplification?
That one three dice attack will do more consistent damage than other three dice ships if you have your falcon equipped properly.
No actually it won't, because for 1 point less you can put down a B-Wing with AdvSen and HLC plus a Tam with an R7 astromech. That's 7-8 dice per attack vs the YT-1300's 3-4. Those two ships flown well can do a ton of damage, plus Tam with R7 is very hard to kill.