They say that too much of a good thing is bad for you. When, on March 16th of this year, it was announced that Justin Timberlake was going to release a second album after already taking the pop world by storm yet again with The 20/20 Experience, eyebrows were raised. It seemed like JT had a lot to get out of his system after seven years away from music; when it was revealed that the album would consist of 20/20 Part 1 outtakes plus some new material, some concerned murmuring could be heard; and now that we've arrived at the release of the awkwardly-titled The 20/20 Experience - 2 of 2, it would seem that at least some of this concern was justified. 20/20 Part 1 still stands out as one of the best pop albums of the year, but since it has now been expanded to what's essentially a double album format, it makes some of the new material look sub-par.

Granted, it did set the bar rather high; the likes of 'Mirrors' and 'Blue Ocean Floor' rank among his best songs, so to hear an album so obviously cut from the same cloth fail to engage sounds like a spectacular misfire. Timbaland serves up his usual beats and seemingly self-plagiarising in the process; aside from 'Drink You Away', there isn't much of anything here we haven't heard from him before. In a similar manner, the most concise Timberlake gets here is the 4-and-a-half-minute 'Cabaret', on which he is completely outshone by a guest verse from Drake.

Lines like, "If sex is a contest, then you're coming first" and "I've got you saying 'Jesus!' so much, it's like we're laying in a manger" suggest he's phoning it in, his guest absolutely smokes him. Songs stretch to impressive lengths, as usual; let's face it, it's his thing now. Sometimes it works, with the brilliant 'TKO' making great use of its 7 minutes, and sometimes it really doesn't. 'True Blood' gets carried away and clocks in at 9-and-a-half minutes.

Timberlake is clearly in need of the ability to self-edit, which means that most people won't stick around long enough to get to the album's best tracks. 'Only When I Walk Away' and 'Not A Bad Thing' ensure that the record rallies for a strong finish, but it's a real slog to get there. There are flashes of greatness throughout, with 'Murder' let down by a half-hearted verse from Jay Z (some way to repay him after Timberlake lit up 'Holy Grail' from Hova's disappointing Magna Carta Holy Grail earlier this year), and opener 'Gimme What I Don't Know (I Want)' making for the ideal opener, but on the whole, The 20/20 Experience - 2 of 2 is overlong, under-cooked and frustratingly uneven.

If he'd waited until now to release an album and combined the 10 strongest tracks from the separate sessions, The 20/20 Experience would have been the best album of his career so far; there's no doubt about that. Instead, his quality control has gone to pieces, and this sounds exactly like what it is: a rushed job that really could have done with some more work.