If you accept that the Lambda isn't worth taking on its own, don't you sort of have to treat Palpatine's cost as 8 points + (however many points you'd have to knock off the shuttle to make it a viable choice)?1) Naked shuttles aren't cost efficient enough to overcome their dial
That's the difference between Palp and Threepio. You're taking Goldenrod on a ship you already want in your list. His Royal Badness needs to be kind of awkwardly wedged in somewhere.
The shuttle is a monstrously efficient ship statistically but the dial is so bad that it will almost never be that efficient. Palpatine when combined with imperial aces is obscenely efficient because of how much more valuable each evade result is on those ships given their low HP pool and sometimes front-loaded survivability. It's not that awkward a fit, anyway- the 28 points for a palp shuttle gives plenty of room for two aces and the shuttle can get some work done itself.
Tactically speaking the importance of the shuttle can take heat off your aces and actually cause it to get more shots off than it normally would because opponents will target it more preferentially. Since the goal of ace lists is to force end game situations where Soontir or Whisper can dominate lower PS ships, the Biggs-ish effect that a Palp shuttle has cannot be discounted.
Threepio is a really potent card itself but I don't think it's on the level of Palpatine. It makes Han an end game monster when the potential offense decreases. If you can afford the MF title he will be able to win a lot of battles against the more offensively anemic imperial aces by taking evade actions and having two 100% evades a turn.