IGN AU Review MGS4 (9.5/10)

[Hapimeses]

'Niggle' is a common word in Britain and I assume Australia. It means:

1. a small worry or doubt
2. a trivial objection or complaint

In this context, a 'niggle' is a minor flaw or annoyance that doesn't really matter, but is present; hence the lack of perfect 10 in the Gameplay category.