For someone with little Soul Calibur experience before now, I feel that Soul Calibur VI can be a pretty good starting point for someone to the series.  The tutorial in Mission Mode will help you learn the basics and you can always look up more advanced moves and techniques for any character at almost any time.  Add in the Mission and Story modes and there's a lot to do beyond just fighting several random CPU opponents and calling it a day.

There's no denying that SoulCalibur VI's core gameplay is solid while offering some fresh mechanics. However, even though it's been years in the making, it feels like it could have used a couple more.