There is not a single thing, to my knowledge, that is wrong with Scotch. It is, after all, the water of life. But aside from Lucius' lack of Muggle knowledge, Glen Morangie, as tasty as it may be, might be a touch too broadly selling for Lucius. Maybe Bowemore or one of the lesser know Islay's, Glen Goyne, if he has family ties to the Queen, Auchincloss for those who like the purity of the old ways...Of course, there are whiskey's far rarer, and I suspect the most rare, by cask strength, age, lack of wide spread knowledgem out right rarity, etc. would be the most appealing to a man as sophisticated, wealthy and haughty as Lucius.