A plucky, fun take on the usually "stoic ninja" stereotypes, or an annoyingly tacky Highly Visible Ninja Barbie, pandering to the very worst Mukokuseki pop culture principles. is either an intriguing and badass character and the coolest newcomer, or a bizarre, out-of-place anime dude that doesn't fit the setting and overstayed his welcome. The whole "go back in time to prevent your big mistake" element-never once hinted as an ability of Edge Master's, one that would've been useful at numerous points in the series-is so Deus ex Machina it hurts.
Why was SC4 considered the worst? I didn't really like it because of the poor online experience (significant lag in a game that's all about low/mid/high/sidestep mixups) but I'm curious to know what the reason is for most people.