Scribblenauts Unlimited
IGN: 8.8
1UP: B (is that an 80? or 85?)
So looks like a Mid 8's review scored game. The reviews read extremely positive with one saying easier but many varied puzzles to solve while other saying puzzles too easy. So the difficulty change one reviewer (IGN) liked (compared to past scribblenaut games) while the other (1UP) didn't like.
SiNG Party
GamesRadar: 7
Joystiq: 4
Seems like it gets one concept right which is to be able to face the audience as the singer and have your own screen for lyrics similar to Karaoke bar setups while audience can see more visualizations and lyrics on the main screen. Where the game reviewer got things wrong is expecting the game to somehow track and score the audience response to queues being given by singer. I don't know why the game reviewer is in game/score mode rather than seeing the game as good Karaoke software. Some other gripes like needing to plug in Mic to the console rather than Gamepad, but no gripes regarding the 50 songs selection included.
Based on actual review content, I think fair to say 6-8 rated Karaoke software designed to be fun for fans of Karaoke with some "game" components also just designed to make you better Karaoke singer.
Question: Why does a game/software need to score you for you to enjoy it and have fun? Just Dance is more successful and fun precisely because it doesn't over indulge in such gaming tropes and focuses more on enabling and making fun a social dancing scenarios.