???
I thought I was pretty good with my stage control but I'll look again.
I only use d-smash to kill so I dunno. I did roll a few times when I did do the mistake you described XD.
Compared to most Marths though I use roll very rarily because I think if you're rolling with Marth you're doing something wrong.
Naw, it's not a very exaggerated problem. It's not really even much a problem so much as it is a pattern. Almost any and all patterns can be punished. And ya, I only saw the dsmash like once and you actually ended up getting a kill off of it. None of that was anything you were really punished for either.
As for rolling, I would say you're fine. Like I said, it's just a pattern I noticed. It's a
bad pattern. Just a pattern. =b You're fairly good at stage control, but I think that if they opponent slowly walks toward you, keeping the fair wall almost in their face but not quite close enough for you to feel the need to try and hit them with it, you start to back up toward the edge of the stage and suddenly you realize that you're at one end of the stage and they're in the center. I saw this the most in the kirby match. In basically every scenario, you took back control of the center in some way, but watch the kirby fight and watch where you go when you're fair walling, and watch how even though you two aren't really even interacting directly(only psychologically), you sometimes give up the center of the stage during your fair wall.