My personal least favorites are the MTT and the B wing.
The troop transport relies on the enemy not shooting at you while you land the even bulkier and defenseless lander and then while it deploys. The only reason it worked on Naboo was because it was a planet of the
To start the B wing isn't even a B. The B wing's self righting cockpit doesn't matter in space since there thanks to artificial gravity there is no vertigo to worry about. And because the wing position is constantly changing in relation to the cockpit it can even become a hindrance when you clip a frigate because you think the ship is on the other side of you.