INXS really dug themselves a huge hole in the early 90's. The followed up their smash 'Kick' with 'X': a slick, calculated album designed for instant commercial success. It didn't sell as well as expected, and by the time they made the more interesting 'Welcome....' the mainstream had started to pass them by.
So the calculated grab for the pop charts didn't work, but the artistic experiment didn't sell well either, leaving INXS at a bit of a loss of where to go next. This uncertainty is evident in 'Full Moon...', one of their least consistent albums. On one hand, they seem to be going for a more stripped-down, rawer rock sound similar to 'Listen Like Thieves'. There are duets with Chrissie Hynde and Ray Charles, and INXS started touring smaller pubs and clubs, suggesting the band was taking a "back to basics" approach. However, the album also contains the sort of heavy production and experimentation seen on 'Welcome...', which doesn't fit, and only makes the band seem indecisive and unfocused.
Take 'The Gift': built around a raw, stomping rock riff, heavier than anything they've done since 'Kick'....but it's shrouded in an overbearing production that robs the song of its grunt. And that's the problem; instead of rocking, the production tends to make the songs plodding and stiff, which might be why some people claim it's influenced by grunge and alt-rock (it's not). It doesn't help that the songs themselves aren't quite as strong as before.
Either way, this certainly wasn't the comeback INXS were looking for, and sad to say it was no surprise the album flopped. There are a couple of good songs here (the opening two tracks plus the two duets), and a cleaner production would have helped, but this is arguably INXS' weakest album.