I don't play too often, on it. But it's very fun, and the best racing game at it's type. It's very good at what it does... but I find it often a little too tasking than exile rating.
By that I mean I spend more time focusing on dodging walls over enjoying the ride, but eh I'm not saying it's bad. It's very fun and skill based. I've been on say twice in the last month and haven't had a problem finding a game any time. It's has a sever selection menu so you can just find a sever that's populated and join it, even whilst there racing.
Even if there are only 4 people on the game, there you go you've got a decent sized race. I've played about 15 races on it so far, mostly setting up my own lobby and people joined (quite a lot of people joining and leaving regularily actually, there are also high ranked regulars (who aren't that good)). I managed to win all my games so far anyway, pretty fun.
I'd get it. Well actually I'd get the bluray version since it's cooler to have it on a disc, I feel. But whatever floats your boat.