For me, the game is still to young (it's in it's demo phase for god's sake). People are still trying to play Samus much like her Smash 4 self.
Yes, she no longer has Dash Attack. But know what she has now?
LOW LANDING LAG AERIALS.
This is an area Samus actually struggled with in Smash 4. Her approach game was heavily limited to Zair/Dash Attack and then mixup with Grab.
Yes, Zair is harder to use in this game, but it's still functional. Grabs are better for her in startup and endlag (still poor overall but a much MUCH better tether grab now!).
But now, SHE CAN SPACE AERIALS ON SHIELD MUCH SAFER AS AN APPROACH!
Nair has (last I checked) between 10 and 12 frames of landing lag? Think of Marth/Lucina Nair in Smash 4 - how safe was that? Yeah... and Samus's Nair does more damage and doesn't need to be spaced... just putting that out there...
What about landing Nair on shield into instant Charge Shot for instant shield pressure? Nair is going to be a GOOD move I feel.
What about getting up off of ledge easier now with Fair's lower landing lag? There are so many more options available to theorycraft with her thanks to the reduced landing lag.
All I am saying is - give it time.
Plus, there could be many more changes yet to see before the game releases. Right now, I think people are overreacting to Dash Attack, while still trying to play Smash 4 Samus.
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EDIT:
SAMUS NAIR HAS JUST 9 FRAMES OF LANDING LAG.
Here's an amazing spreadsheet of pretty much all recorded changes in the demo so far, WITH frame data comparisons -
https://docs.google.com/spreadsheet...t9Fk2zmmSvcEH8rBy6GVAHEtQk/edit#gid=519658986