I do love Oasis and no doubt this collection has some classic songs on it (Live Forever, Slide Away, Wonderwall, etc), so really it should breeze through with 5 stars easily.
However, 18 tracks for a double album is simply not enough! Basically this album could easily have been released in 1996, as it only has a mere 4 songs included from there last 4 albums! Where's Stop Crying Your Heart Out? Where's Stand By Me? Where's Gas Panic!? Where's Little By Little? All missing. They could EASILY have included all of these onto the album if they wanted to. And yet, even looking at the first two albums, there's still a wealth of great songs missing (Sad Song, Whatever, Rocking Chair, Hello etc.)
Basically this collection is far from complete. Buy anything up to and including Be Here Now, and if you like it get the rest of the albums, if you just buy Stop the Clocks you'll be missing out on so much! However, like I said, the album does contain a large amount of good songs regardless, so if you are tempted, at least buy Be Here Now afterwards. (There are no songs from Be Here Now on the album, dispite it possibly being their best work)