Spam bomb against roll spammers. It's hilarious.
That said, I'm very frustrated with Samus right now. I've been letting my son pick who I play as and it makes me mad when I go back to Samus. I've made similar posts before but other characters in general have good stuff going for them (or if you'd like this highlights Samus' weaknesses):
1) Functional usmash. Yes Samus got a little buff to her tragic usmash, it's still pretty bad though. Literally every single other character in the game has a more functional usmash than Samus even after the patch. Even animations like Roy's, Mewtwo's, ROB's, Villager's, Megaman's, etc. have scooping hitboxes to put small characters into the sweet spot.
2) Rolling doesn't open them up to a 14 frame punish window that literally opens up at the perfect time to challenge on reaction. They aren't forced to use SHAD (although many characters don't even have it as an offensive option some do, like Marth/Lucina and Olimar).
3) Dsmash that kills or actually has good coverage. Samus' does neither.
4) All moves are safe on hit. This isn't quite totally true, some characters do have moves that are unsafe on hit, but Samus has at least two, jab1 and ftilt sour spot. That's just harsh since those are the main tools in CQC to get some breathing room. She has more if you include the fact that fair can be interrupted by some characters as low percents and that people can fall out of usmash and punish.
5) Shield grab is a powerful option against virtually all non crossed up and arguably poorly spaced aerials (true for about 75% of the cast). A whiffed grab doesn't give your opponent enough time to falcon punch you.
6) Multihit aerials self connect better. No one falls out of ROB's uair, or Sheik's uair, or.... Uair often misses the last hit because the hitbox is smaller; opponents often fall out of fair even with good offensive DI.
Then, after I play other characters and I am just smoothly doing what is intuitive, I go back to Samus and I have to remember not to roll and use SHAD, and not to use usmash (for the most part), and to use dtilt more than dsmash, and to space my ftilt to avoid my sour spot, and to only use jab1 after my opponent is at about 30% and to only string it into jab2 at 60%, and to use upb OoS instead of shield grab, and to avoid SH fair, and to angle my fsmash down if I want a more reliable hitbox, and to use uair instead of nair to break combos. #justsamusstuff