If something is fun or not its up to you. Theres no way you can generalize how much fun something is, some people will have fun with something you dont... thats just the way it is.
You are the one to decide if you yourself are having fun. I've been here since these servers were in beta, and since then Ive only got 4 wins (8 if you count the erased ones I got IN beta)... that says a lot about why I play, everybody wants to win, hell, as bad as I am and even if I dont nearly play as much as I used to, I do too and Im quite the rager when I die (not in chat though, never throw your rage in the chat); but its up to you how important you are gonna make that matter and that will define wether if you'll have fun or not playing MCSG.
I hate how competitive people get, I play for the fun, and winning will always be my secondary objective. That and the people Ive met here are the reasons Ive been part of this community for two years and I still plan to be for as long as this lasts.