I like Shand House, that style of 1950's architecture I like as its a continuation of similar styles from the 1940's and 1930's. But it's not a patch on the original building for the Blind Institute:
http://www.cibi.co.uk/about-us/history/I'd put the The Empire Pool in a similar category. But I'm not sure what it would like like today.
Brunel House is in need of a facelift, as does Capital Tower.
Stadium House is utterly awful and the refurbishment/re-cladding has just made it worse!
The trouble is, many 1960's buildings look fantastic in old black and white photographs (just look at the works of Nervi), but they don't age well at all and you get a lot of problems with the concrete that are difficult to repair.