I don't think it would be right to start passing Lucas off as low tier already. Too many characters get overlooked for being hard to play or not having the same immediate strengths. Falco isn't exactly good, but he isn't bottom tier like people say and can do damage incredibly quickly. Robin gets put into bottom tier, which although she has a terrible run speed and mediocre grab, makes no sense given she has some of the best spacing aerials, easy and incredibly strong KO moves/ setups, and absurd off-stage. Meta Knight was immediately passed off as garbage for his wonky hitboxes and "it's not Brawl," but it's pretty clearly been shown that he's viable and a serious threat at this point. Obviously tiers always matter. But characters in this game have at least been given enough strength that a low tier can still body someone using a top tier off of a few good reads or tricks, even if the neutral is pretty one-sided.
I know it's dumb that Lucas comes with so many obvious flaws rather than just making him straight-up strong from the start like Roy or Sheik. But knee jerk reactions won't get help anything. It's what got DIddy ignored for months, yet Greninja got unfairly nerfed straight to mid tier. And if Lucas ends up needing help, then maybe he'll get it. This patch came with some pretty unexpected and significant buffs for low/ mid tiers, so we'll see.
Although they still refuse to nerf Sheik in any ways that actually address the problem she poses to the metagame.