Man, Tecmo-Koei really did the minimum required for the Gaiden Master collection, like, holy shit, Sigma 1 is a straight-ass port from the PS3, meaning, it doesn't even have rumble function for Christ's sake (DS3 wasn't even a thing when it came out), Sigma 2 is, well, sigma 2 - they couldn't even be arsed to port the ps Vita version where they introduced gore back in with NG3RE being the sole exception of a "good" port since it looks better than the other available versions (not that it makes the game any better).
Also : they took the multiplayer part of 2 and 3 out (why?), Sigma 1 still has those awful lol-worthy in-game 1-2 seconds loading screens which completely break the action/flow, there is dropped inputs everywhere and the camera...oh man, I don't remember the camera being that bad, for some reason it's way worse than vanilla ninja Gaiden black if that's even possible (and I finished Black for the Nth time on my xsx 2 months ago).
This collection feels like a last minute hack job, it's like they don't give a shit about this particular franchise anymore.