NGRE i'd consider different enough from NG3, cause they actually put a lot of the mechanics back to be more similar to NGS2, even though there are still certain parts that are dumbed down based on the original 'streamlined' vision.
Razor's Edge is good. At least from playing that I can see that they still understand something of what it means to be a Ninja Gaiden game. I don't think anyone can play that game on hard and tell me that's not brilliant combat.