My snap judgments:
Legasista- I know it's by the ClaDun folks and it looks nice. I wasn't too keen on ClaDun, but if Legasista has tighter controls and gameplay interfaces/ character growth systems that aren't so obtuse, it could be fun.
Mugen Souls- Yep, seems like fairly typical !f/Compile Heart. I felt creepy reading that aspect Kevadu pointed to. But a part of me is still somewhat morbidly curious if the "altered" aspects affect the game any (i.e. both the Japanese and NA versions of the Albedo-Momo torture scene in Xenosaga I got the point across, even if they were different).
Witch and 100- As long as this game is better than that DS game A Witch's Tale, then there's hope. The game does have that Halloween cutesy appearance, but again, I feel totally creepy looking at that protagonist.