I guess it would depend on what kind of games you enjoy. There are lots of players for Sotis, Nexus wars, Squad TD (top10 popular maps)
And you can get games aranged pretty well with semi-popular games too with the open games.
But if its an unknown game, its pretty hard to get players...
I think Iv had my moneys worth playing custom games. I even think the open games system works pretty well, but you still cannot really get players for unpopular maps :/ (or it takes long time to wait). The community is pretty bad in my opinion, but I do greatly enjoy playing custom maps with other mapsters.
this is my experience from eu