Yeah...some are duds, and unfortunately a lot of older music falls into that category, because the drummers didn't use click tracks or drum machines and thus don't keep the kind of consistent, precise beat that the track generator requires. And then there are the songs with tempo changes, long periods of silence or spoken word, etc. The track generator doesn't like to leave big gaps in enemies, so it normalizes the quiet parts and starts generating based on relative loudness, which can produce jarring results.
But all in all I think it does add a lot of enjoyment to the game via the tracks that do work. As such, it's the first-ever beat-matching game that has a worthwhile music import function. But according to pocketgamer's review, no one really wants that because Vita memory cards are too small/expensive to store a whole music library, so it's not even worth looking at for the review.
I'm really hoping that the game succeeds despite the mediocre Metacritic score, because there's so much room for feature additions and such, not just with the track generator but the game as a whole.
In an ideal world, I'd get to make a sequel with fewer mechanics limitations (such as combining hold+release with red or blue enemies), more hand-scripted music, dynamic staging (instead of just the mid-song slo-mos, there'd be transitions from one location in a level to another, like jumping down from a balcony to fight on a lower level, to make the game feel more like a kung fu film), more animation variety, a dueling mechanic (for 1v1 fights, rather than just 1 hit per enemy all the time), multiplayer, etc. But realistically, the low reviews mean no sequel, maybe no ports either. Plus I owe my boss a magnum of good wine if it ends up below 70 :/
