I woudn't say Nana is good at recovering either... and she never comes back.
As @
ParanoidDrone
said, Luma literally has no recovery whatsoever. And not only that, but a basic smash attack sends Luma flying incredibly far. Often I'll find Luma taking a hit at the center of the stage, and it's still enough to send Luma flying off. So yes, Luma unlike Nana comes back, but Luma dies much, much easier. I wasn't the one who brought up the Ice Climbers comparison, but if someone wants to talk about how Nana never came back unlike Luma, then this needs to be pointed out.
To bring the subject back to competitive play, what do people think about Rosalina's situation in the tier list after this nerf, if it is indeed real?
For one thing, I'm not quite sure how big of a nerf this is yet. Assuming it's true that Luma can no longer act while Rosalina is grabbed, this certainly means that Rosalina can be pummeled now when her Luma is with her, which she definitely couldn't be before.
As has been mentioned, certain throws automatically worked around Luma shenanigans (for example, Mario's back throw). Now these throws will still be safe to use, and they'll be able to include pummeling you as well.
But the thing is that... in my experience, Luma wasn't able to break Rosalina out of most grab and throws anyway, so long as Rosalina is thrown
right away and pummeling is ignored. What Luma
was able to reliably do against many throws, however, is punish the opponent right
after Rosalina has already been thrown.
And based on what I'm seeing, I'm not so sure this has been changed?
Basically what I'm saying is that in practice, the only thing this seems to change to me is the fact that Rosalina can now be pummeled.
So, to answer your question... I think RosaLuma is still top tier. Before the nerfs she was my pick for #1 overall, but only by a little bit. Now she drops... maybe a place, or two, or three? Personally, I think I would put
Diddy #1,
RosaLuma #2, and say that characters like
Lucario,
Sonic,
Sheik,
Yoshi,
Peach, and maybe
Ness are all very, very close. This is of course assuming that other characters I mentioned have not been nerfed.