It is my opinion that the three songs on this single are the three best songs released during the Standing On The Shoulder Of Giants' era. There isn't a song on the 10-track album that can touch either one of these stellar b-sides. But what else would you expect from a band whose best 'album' was a b-sides compilation? While being the first, "Go Let It Out" is easily the best single, although both "Let's All Make Believe" and "(As Long As They've Got) Cigarettes In Hell" outdo it and certainly have potential to become two of your favorite Oasis tracks of all-time. No kidding.
Both b-sides are on the slow side, with Noel's voice being the focus of the songs. "Let's All Make Believe" uses its title to make some timeless lyrics, such as 'let's all make believe/that we're still friends/and we like each other', which is as pertinent as it is humorous. With "Cigarettes", Noel's voice and the title are again used to carry the song; as Noel claims 'I don't mind not goin' to heaven/as long as they've got cigarettes in hell'. Oddly enough, the best part of the song might be the sound of an igniting lighter and the fading coughs in the end.
As far as "Go Let It Out"... don't buy this single if you've only heard (and want) that one song. Start with the actual album and decide from there if you're still interested; there were a number of Oasis fans who were disappointed with Standing On The Shoulder Of Giants. In all reality, though, I listen to this single more than the album itself. So I don't see any reason why you shouldn't buy this. I got this single as part of an Oasis singles lot on an online auction site (that featured 14 other Oasis singles), and besides, maybe, the "Whatever" single, this was the best one. Go let it in.