I lived for years (and grew up) on the northern side of the city which is generally pretty nice (and so is the western parts around Tatnuck Square and Worcester St College...straight northern ORH near Indian Hill/Greendale/Burncoat area is a little more blue collar than west side but still pretty nice).
But yeah, they never have addressed actual downtown. Hubbdave mentioned how the canal distrcit is making a comeback too which is nice....but this is pretty localized. The new stadium will be near there, so hopefully it helps expand the growth. They really need to revitalize Main Street between like the Police station and Hanover Theater over to Pleasant St south of Park ave. So much of that is still pretty dumpy. They've made slow progress, but there is a ton of potential there.