It's... bloated. The interface is more eye-candy than actually being useful. (Even if it is amed at the eye candy, i still hate it)
The features are exactly the same as MSN 6, if you don't count the useless features and the sign in on any status. The memory is even higher than in 6, which lags at some times on my pc
From all the MSN versions to date, give me 4.7.