No, I think you are mistaken. The reason his kit is so fun to play is because of how much added power it has over all other ADCs with his passive. I think simply because of his passive allowing him to win almost all early game trades makes him fun to play because you are really never going to be "behind" on him like all other ADCs can be. His kit is smooth to use I agree, but if he did not have such an advantage, I do not think he would be played nearly as often. Do not get me wrong, he is fun to play, but I think a lot of that is due to his lack of any early game/mid game/late game weaknesses apart from mana.
Take Jinx for example. Really fun to play. But that first 15 minutes are shitty because almost everyone out trades you and you have no mobility buffs until you actually kill a champion or an objective. She needs about 2 items to get going, then she is fun. Lucian can just enter any fight with out having to consider if he can at least come out even or better. His answer is always yes and if it starts to look bad, he can just E out of the fight.
Remember back when the only 2 ADCs that where ever picked were Lucian and Ezreal (this was before the lethality meta)? They were picked simply because while Lucian had trade advantage, Ezreal had poke advantage and both had mobility. Ezreal was the only champion who could avoid trading with Lucian and still potentially match or beet him in farm. Caitlyn was the fall back in case either were banned. Mostly since she has her range and combo/siege advantages.