I'm tempted to get Sigma now.  I only played the demo, but never bothered to get the game thinking I'd never be able to play the sequel.

But now the sequel has been announced, and I can get the game dirt cheap.  Why not go for it?  Because I have way too many games to play. 

xD

From what I've read on neogaf, some aspects of the Sigma engine are just better than the NGII engine.

Personally, I think Sigma 2 will share the best aspects of both engines.  It'll run smoother, and incorporate new additions NGII brought to the table such as gibbing.  Plus, since it's releasing a year later, it'll probably have an extra bit of polish overall, similar to the other late ports this gen (Virtua Fighter 5, Oblivion, Bioshock, etc.).

A great excellent game. But is very difficult.

I'm bidding on this on ebay. Hope I win!

Good luck MM.

This is really a good game game.

Ninja Gaiden Sigma was only a slet down to me because it was no different then NGB was. However, to those who never played NG, it was a fantastic game. NG2 is the best Ninja Gaiden game ever, so its very likely Sigma 2 will also be the best NG ever made.

Turns out the seller I'm bidding on leaves only an hour or two away.  I just messaged him about it.  xD

No, Ninja Gaiden II is not better than Sigma.

Sigma's platforming and puzzles were so much better, and it had two playable characters. It ran smoother, didn't have glitches that make you start over, far better camera, better boss fights and the water parts weren't as bad. Ninja Gaiden 2 seemed rushed at the times.

 Ha...funny.

Ninja Gaiden 2>Ninja Gaiden Black> Ninja Gaiden Sigma> Ninja Gaiden

Rachel as a playable character was by far the worst design choice I had seen in the series to date, I can't recall any game breaking glitches from the 5 times I played through NG2 or during the playthrough with Sigma either. They both ran smooth as peanut butter except for a few moments in NG2 where slowdown fu**ed the game. The camera was no better then any past Ninja Gaidens, and the boss fights were worse by a large margin. They weren't as cheap as NGBlack, but they were still 100 percent more unfair then Ninja Gaiden 2's fights, not nearly as fast paced, and did far more damage per hit. Ninja Gaiden Sigma was Ninja Gaide Black on PS3 with better graphics.

What else?

Who to believe, who to believe...

I'm gonna go with Riot.  He may have iffy opinions at times (okay, all the time), but all our Brawl games together puts me on his side. xD

Damn you Meta Knight!