Disc 1 has nothing but back to back classics with cheesy pop monoliths such as 'I Should Be So Lucky' and 'Never Gonna Give You Up' alongside dance tunes like the brooding 'Killer' and the fabulous 'Saturday Night'. Can't really fault this disc, i loved every song. 5/5
Disc 2 is quite feeble in comparison, i only liked 12 out of the 20 songs. You've got the horrendous Titanic theme 'My Heart Will Go On' alongside other feeble ballads such as 'No Matter What' and 'Bleeding Love' and *gulp* 'You Raise Me Up', a song so sugary that it makes you wonder why the album didn't come with a sick bucket included just for that one, solitary song. Dismal. But there are some decent tunes on here. 'Livin' La Vida Loca' is an absolute belter, 'Mambo No. 5' is an infectious tune, 'Oops!..I Did It Again!' is Britney at her most poptastic and catchy and 'Grace Kelly' is a joyous little sing if you can tolerate the ear puncturing falsetto in the chorus. But there's too many forgettable songs on here such as 'Just A Little', 'Push The Button' and 'Sound Of The Underground' alongside the aforementioned ballads. 3/5
Disc 3 is even worse with only 10 songs appealing to me. We get a trio of excellent songs that kick off this disc: 'Rolling In The Deep', 'Bad Romance' and 'In For The Kill'. But then we get a few uninspired duds such as 'OMG' and 'I Gotta Feeling'. One Direction, PSY, Ed Sheeran, Jessie J and Bastille provide the best tunes. It speaks volumes that the weakest disc is full of modern songs which indicates that modern pop music is really heading down the drain.
Nevertheless, it's worth the money if you don't mind wading through utter dross to find the gems on the later discs.