Which isn't necessarily a bad thing. Samus, Ganondorf, Jigglypuff, Zelda, etc. were all bottom tier in both Smash 4
and Brawl, because while they did receive improvements from Brawl, they were the kind of base improvements that everyone got as a consequence of the game being faster. A lot of people think Ganon is going to be so much better in this game because of how much faster he is, but that's just the same thing mostly. Everyone's faster.
The problems with low-tier characters are usually more fundamental. Good characters are ones that are both fast and versatile. Little Mac has the best ground game of all the characters, but he's low-tier because he sucks in the air. Ganondorf's problem is that he's slow and most of his moves aren't good for competitive play. He's faster, but so is everyone else, but his moves still suck. Samus has a similar problem where her ranged moves aren't that great for competitive play; they're more like Ridley's Down-B, which Sakurai admits is better for 3+ player matches where you can catch players unaware, but not so much in 1-on-1's. So if Samus's moves have different effects, that might be a good thing. Time will tell how these characters have been affected by the changes.
Ridley has quite a bit of versatility to him from what we've seen so far, and he's pretty fast compared to other heavyweights like Dedede and Ganondorf. His command grab is also a really damn good move, so I can't wait to see how that's used competitively. On the ground, it's a free "GTFO the stage" move, and in the air,
it can be used to lob people under the stage.