UYI 1/2 were definitely one of the most anticipated album's ever. If you combine the great songs from both of those albums into one album, you probably have the greatest rock record of all-time, but as it is they are just two very good records, because there is too much filler on both.
As far as the new songs go, there's some good ones (The Blues, IRS, Madagscar), some decent ones (Chinese Democracy) and some downright pieces of shit (Oh My God, Rhiad and the Bedouns).
This Gilby Clarke quote I read a while ago really best sums up the new music..