I was pleasantly surprised by it,
I'd heard it's not that great and sort of shoved in so that it wasn't all online, but it was a lot of fun.
There's also re-playability value as there's items hidden throughout the levels you can collect. And blowing things up is fun
Re-bought Test Drive Unlimited for the 360, had it 2nd hand, disc died so I got it 'cos I love it, a very easy way to waste a day just drivin around and occasionally racing and instigating police chases.