What a setting! The history-hopping stealth action series drops into Revolutionary Paris in Unity. Arguably the first game of the "next generation" uses more processing power to render a gigantic, living city teeming with revolting peasants, towered over by Gothic cathedrals and stuffed full of passageways and distractions. Assassin's Creed: Unity looks so real you can almost smell Robespierre's breath. Such a shame, then, that the game fails to engage meaningfully with setting or period.

God-sent sea monsters and divinely ordained human sacrifices don’t wash well with opera updated. The favoured contemporary take on the post-Trojan War myth of Mozart’s Idomeneo, which may even have originated in the last Covent Garden production 25 years ago by a fitfully brilliant Johannes Schaaf, has been to put a populace at risk from natural disaster and pestilence. Clearly the programme was expecting something of the sort, with its images of Hurricane Katrina. But no, for director Martin Kušej, the only monster is the state.

Andrew Graham-Dixon’s villainous alter ego got a second airing tonight in his exploration of 19th-century Britain’s love of all things Gothic. Last week we saw him hanging about in decaying graveyards, or appearing, wraithlike in a dank corner of a Gothic ruin, while ravens circled portentously overhead (main picture). We saw him relating tales of horror and mystery in flickering candlelight, or peering through the flames of an infernal bonfire, and in tonight’s episode, always one for going the extra mile, he was touring Victorian sewers, with only a rat for company.

You may be more familiar with the Italian title, Il mondo della luna, but chances are you won’t have seen this or any of Haydn’s other 16 operas. You haven’t missed much, at least until the last of his works as court composer to the Esterházy family, Armida, an "heroic drama" rather than the slim comedies which don’t seem to have inspired the composer to the heights of his symphonies and string quartets.

To take Figaro – the ultimate operatic assault on class distinctions and social hierarchies – and set it on a giant revolve is a gesture as wilful as it is elegant. Not only are divisions of above and below-stairs dissolved in this steadily circling world, but also those of background and foreground, onstage and offstage. By the time the set’s rotations revealed two young valets with their trousers down, relieving themselves up against a palace wall, some few minutes into the Overture, Fiona Shaw had already won her audience and her case.

What’s the collective noun for mezzo-sopranos? A "warble"? A "might"? A "trouser"? Whatever it is, it doesn’t get a lot of usage outside a choral context. Where in opera would you ever find multiple mezzos sharing a stage? Hardly anywhere. Except, that is, in contemporary castings of baroque operas.

2014 is the 250^th anniversary of the death of Jean-Philippe Rameau, France’s baroque giant and maverick. To say that the UK celebrations have been muted is to put in generously, reconfirming a national trend that has long sidelined this repertoire in favour of more familiar Italian and German contemporaries. So it was especially good to see the Wigmore Hall full for an anniversary concert from instrumental ensemble Les Paladins and soprano Sandrine Piau.

He was not only a bracing conductor/harpsichordist pioneer in period-instrument authenticity, writes David Nice, but also a gentleman and a scholar. My only direct acquaintance with Christopher Hogwood, who died earlier this week at the age of 73, was in two projects dear to his heart: the recording of Handel’s Orlando, mentioned by its countertenor star James Bowman below as a highlight of his career, and his phenomenally well researched Haydn symphonies series, both for that handsomely logo-ed early music branch of Decca known as L’Oiseau-Lyre.

Nicholas Hytner’s 1988 Magic Flute may have trilled its last at English National Opera, but judging by the wit, the joy and the energy on display last night it would be absolutely criminal to put the director’s even more elderly Xerxes out to pasture – the show that brought Handel back into fashion when it premiered in 1985.

There are 15 characters in Robert McLellan's quirky 1948 comedy, but the star is the language most of them speak. To mark the referendum later this month, the Finborough is mounting a season of Scottish work, including a trio of classics, under the title "Scotland Decides 2014/Tha Alba A'Taghadh 2014". While the linguistic medium of The Flouers o'Edinburgh is more accessible than this might suggest - Scots rather than Gaelic - it nevertheless requires a Southerner to make some effort to tune in.