I don't know about u guys, but Sigma 1, not a fan, Sigma 2, not a fan, Razor's Edge, not a fan. still have Black and vanilla 2 on 360 so if I really need my NG fix those are always there, but i dunno, might be skipping this trilogy
honestly outside of some QoL changes there's alot of stuff Sigma altered that i didn't care for, and the new stuff they added didn't do much for me (dual swords and playable Rachel I can live w/o)
and Sigma 2, it's fairer, but less visceral and less entertaining
The Sigma versions can in a way be seen as different games, also there's some plus to them at the very least, like NG2's multiplayer missions where Rachel, Momiji and Ayane can also be used, the Ultimate Ninja missions are also fun etc. but at the end of the day they are the inferior versions of the rebooted NG games.