Photoshop cannot - ever - make bad photos miraculously good. So if you don't care about blurriness, lighting, exposure, composition etc, but say to yourself, "hey, PS will fix it for me", you are wrong. PS cannot fix blatant mistakes.
However, editing one's photos in PS is no sin and no one needs to look down upon those who frequently "send their photos through PS". I do so with mine. But photos that went wrong from the start either get deleted even in-camera (sometimes, however, you can't really tell from the little screen, so you better leave it until you can see it on the computer screen and then decide again), or they get deleted upon my first viewing them, or they get deleted in the RAW-converter programme, if the error is so that not even fixing the RAW data works (and yes, I have had photos of the kind!) ... that is mostly the end of the photos with major flaws. OK, sometimes I think "Let's put it into PS and see if a crop can help", but often enough those with big flaws don't even get converted, they die a RAW-death.
After that, though, I will invariably look if the highlights and shadows are ok and if I am happy with the original crop. Often I wish to lose 2 cms on one side and 1 at the top or something like that. And that is always done in Photoshop.
I once took a photo in Portsmouth, where there were some nice old houses in front of a modern block of flats, and that --- grrr! --- street light right in my view. My friend was not willing to chop that street light down for me so I'd get my photo without it, so I composed the photo in a manner that the street light was right between those old houses.
And later I put up that photo into our forum's Photoshop Challenges (because I knew I would not be able to clone out that streetlight all by myself) and lo and behold, someone was able and willing to spend time on that photo in PS to clone out that street light.
I admit that when I composed THAT one photo, I did so in the hope that eventually someone versed well with the clone tool would be able to get rid of that light. Other than that though... it is much more FUN to plan and set and compose so that only tiny adjustments will later be necessary, I think.