Hi Dan, good to hear you are trying to get back into Shadowrun. Games are still going regularly, at least when I play on Sundays there are. Unfortunately, the matchmaking will lie about how many matches are going. It will say 0 for me constantly, but I can join friends and recent players in matches already going. Hopefully the community will get a boost when backwards compatibility launches on Xbox One next month. Hit me up on live if you need to hitch a ride into a match on Sundays. I still have several PlayShad0wrun accounts I use.
Always remember, those who play Shadowrun are better than those who don't.