the games were hard. Personally, I always played them using the Debug codes that gave you invincability. however, I still found the 3D stages to be a little too hard, particularly the ones from ESB, because you couldn't change speed and the animation was too choppy.
being a Castlevania Fan, I liked the stage where Slave Leia Takes on Jabba the best as she controls like a Belmont! (complete with a "Whip")