Singing when you're winning.
The variety of songs on offer, on the actual disc that is, is debatable, as I, someone who doesn't use Singstar commonly, thinks it's a brilliant mix of tunes like Gorillaz and Weezer, my mum, someone who breaks out the mics with every waking oppertunity thought it was too modern and lacking some "Golden Oldies", which I can totally agree with, but, singing Toxic is fantastically hilarious when gran's round and is a worthy addition to the 40 strong tracklist. It all simply depends on opinion, and my opinion says its the best Singstar line up since the game launched in 2005.
There a few annoyances in the game which have been present since that 2005 installment which you think that could have been easily sorted with a bit of common sense such as the fact you can still mumble, you can still score big as compared to giving the ultimate performance of your life with smoke and fire and flares, which is a bit disapointing and I hate the Rap Metre, as far as I'm concerned it should be called the "Let's Talk a load of **** Metre, its basically pointless.
Overall, online is fantastically enjoyable and well constructed and I can see it becoming a prominent feature of owning a PS3 and is a terrific party games, however not the party game of choice, losing out to Guitar Hero and Buzz! anyday but is still probably the most appealing and the easiest to grasp out of everything available.