I am thinking about buying Sins but I would like to get some idea of how active it is these days? Will I spend ages trying to find people to play a game? I'm on GMT. Thanks for the help.
It's a great game, but sadly, the online multiplayer aspect of it is pretty dead. For regular Sins, you'll find almost no pvp activity since it's mostly newer players playing passworded comp stomp games with their friends. (Amazingly, there's guys who've played over 100+ comp stomps online who have yet to try it against real opponents (other people).) You won't find much pvp activity for the Entrenchment expansion, either, since most pvp players purchased the Diplomacy expansion.
For the Diplomacy expansion you will find some 4v4s and 5v5s, but they normally occur in the North American evening, which is probably around 2:00 am GMT. Also, you still have to wait for those games to fill at that time.
It really is a great game in online multiplayer, and it doesn't have nearly the number of people playing it online as it should. However, I can't recommend it for someone who's interest is online multiplayer pvp right now. It is over 2.5 years old, so I guess the online multiplayer activity is showing its age. The release of Starcraft 2 really hurt us, though it wasn't all that much better two months ago. Perhaps the biggest problem with this game is that 99% of all purchasers only played it offline in single player.
Maybe if you could find the game and its two expansions (Trinity) on sale somewhere for 5 pounds it would be worthwhile.