Characters I think are better than ROB, and reasons why:
These characters are almost indisputably top characters. ROB realistically is not a top contender.
Greninja is Sheik with worse tilts and DA but arguably better projectiles and better Smashes. And then some funny things with Up-B which also give him a great recovery for deep edgeguards. That gameplan overall makes him a better character than ROB.
Marth does everything well aside from forcing people to not play conventional footsies like other top tiers. Hard to trap, good in neutral, and KILLS. ROB not only can't trap people as well as Marth, he doesn't even have anything that compares in terms of raw damage and knockback.
Still the same character with ridiculous mobility, great damage, pressure, and punishes. Though Jigglypuff now outclasses him.
Basically nobody except guys like Sheik, Yoshi, and Marth can dare to disrespect Mac in neutral.
Captain Falcon's tilts are about as good as ROB's except he has better mobility and actually is very good at juggling. He also even has better edgeguards than ROB with weak knee.
Duck Hunt's camping game actually leads to legitimate traps in neutral as well as negative state. He also has better Smashes than ROB and is a much smaller target making him CONSIDERABLY less vulnerable to fullhop spacing and traps.
Both these characters have better projectiles than ROB, and better tilts and Smashes. With multiple jumps they also get out of traps more easily and edgeguard better than ROB.
Falco has the best reflector in the game which also serves as one of the best pokes in the game period. His normals are all better than ROB's in terms of speed and damage while not losing in range, and he has a better recovery than ROB.
Peach is Peach and a ***** to trap and space against. She also massively outdamages ROB and is impossible for most characters to edgeguard reasonably. Plus Turnips.
Even though he's bad on the ground, he rarely needs to fight on the ground anyway when there's far fewer counters to his F-air spacing in this game. And nobody can dare to disrespect his B-throw or PK Thunder (watch Fsann play Ness).
Toon Link is still the same annoying bugger and camps better than ROB especially with buffed Bombs. Also a small target that runs fast.
This character not only gets out of almost all traps for free, she has strong and REWARDING footsies, deals with projectile zoning easily, and she KILLS you easily. ROB can't do any of that, except just be passable at footsies.
This character is kinda like ROB in that their pokes are decent but not exceptional, and they have projectiles that aren't super great in neutral but good for capitalizing. The difference is Bowser Jr, while he has a tether grab, he actually has LEGITIMATE item related shenanigans, WAY better combos, and WAY better edgeguarding.
And not counting the Miis,
that's already half the cast in this game who I think are almost guaranteed to be upper tier characters. What about characters who AREN'T upper tier?
Link has Jab confirms into KO moves and can survive longer than ROB due to his faster falling speed while actually having a very strong recovery in this game. Plus Bombs and Z-air > Gyro.
Arcfire is STUPID. So is Thoron. Robin also actually edgeguards REALLY well while ROB is terrible at edgeguarding.
Yeah he got nerfed hard. His throw combos/traps are still REALLY GOOD (D-throw -> Tornado is seriously good. Tornado does mad legit damage). He's a MONSTER at edgeguarding, still has some gimmick juggle gimps off the top, and he can't be trapped easily due to his amazing Down-B.
His weaknesses are extreme, but really not too unlike ROB's. But his strengths are clearly better than ROB's. He's better in neutral than ROB and does way more damage.
She's a nerfed Marth, but still has the advantage of being hard to trap and dangerous when juggling and edgeguarding. And her normals are still better than ROB's in neutral.
Like Bowser, with a better D-tilt and Down-B for frame traps and the spammable B-air instead of Firebreath, command grab, and Up-B out of shield.
Has a good reflector, arguably the best grab reward in the game, and can't be trapped easily.
Can you see why I believe this character is not valuable competitively?