'Hot Space' is infamous as being Queen's sole 'flop' album, as aside from the David Bowie collaboration 'Under Pressure' (which itself dates from a separate session a year before the album proper, and so in a sense could be described as a tacked on extra here) the singles from this album all failed to make an impact on the charts and the album was quickly dismissed as a misfire. Looking back while 'Hot Space' could never be described as one of their best albums it's certainly massively underrated, and to my ears is a far more interesting album than follow-up 'The Works' (by which point the band seemed so desperate for a hit single that the album feels more like a shallow compilation of A and B sides).
The big sticking point for any Queen fans will be 'Hot Space's original A-Side, where the band jumped onto the funk/disco genre with wild abandon. With 'Another One Bites The Dust' being such a big hit for them before Queen seem to have become temporarily disco obsessed, and the first 5 tracks are all based heavily around massive bass riffs. Where on 'The Game' the band had begun to use synthesisers they were mostly laid over the top of the normal Queen sound, but now the bass guitar is replaced by keyboards, the drums are replaced by drum machines and Brian May's signature guitar is cut back to a bare minimum. It's undoubtedly a shock, but for the most part the songs DO work, where the band may have overstepped the mark is in giving over an entire half of the album to this genre.
Even for those who aren't convinced by the disco/funk tracks Side-B is a return to the more familiar Queen rock/pop sound, with 'Put Out The Fire' being the albums sole heavy guitar rock song, while elsewhere the band provide a pair of ballads ('Life Is Real' and 'Las Palabras De Amor') the up-empo guitar pop of 'Calling All Girls' and the slow funky 'Cool Cat' which features Freddie in falsetto voice throughout.
'Hot Space' shows many of the faults common to the bands 80's output: too much synthesiser and a lack of the genre-hopping and invention of the bands 70's work, and this is also the first Queen album where Freddie is the sole lead vocalist on every song (Brian and Roger now relegated to backing vocals and the odd solo line here and there), a sad mistake which unfortunately would hold true for each of their remaining albums and stripped the band of the variety they once possessed: however, compared with the albums they produced before and after this is by no means a 'misfire', and worthy of rediscovery.
Not a classic, but by no means a failure either, 'Hot Space' is a good solid Queen album.