Not sure how canon Ninja Gaiden is to the series. If it is, sure, which does change things somewhat. Without those feats, I would downgrade it below the SF/Tekken/KOF range, due to...well, nothing in it on the same level as the feats in those games, outside of Ayane's powered up attack and occasionally Ryu cutting down futuristic fighting vehicles with a sword or blowing them up with a Ki attack, as I recall.
Above Virtua Fighter, but not exactly into the range where EVERYONE is pulling off the stuff that their best characters can maybe do once in a while. ^_^ If that makes sense.