MN9 is nowhere near the worst. Unsung Story or Project Phoenix are magnitudes worse.
Yeah, I guess that depends on perspective, but the 3DS and Vita versions never arrived, so yeah, for me, it's one of the worst(and I didn't even pledge to it). I haven't heard of the other ones you mentioned, but another reason I brought up MN9, was the high level of interest it had. And what it was supposed to offer for MM fans dying for a new game. For fans of MM, I can't imagine a bigger disappointment than that. I was hoping it was going to be good, as I planned to buy it at retail.
As far as SK versions go, I think I own 3-4, as I have a few digital versions, and a few physical ones. I love supporting stuff like this, and it's far and in-between sadly, but SK is a shinning example of a awesome indie title.