Worst pub? Too many to choose from (mainly J D Wetherspoon)
Especially if they're in Reading, situated by suburban housing estates and have white vans parked outside.
I think of lots of lovely pubs though. I have some good ones in walking distance. A great one is the The Bell at Aldworth http://www.aldworth.info/Aldworth/bell.html
No draught available, but a nice garden complete with chickens and loads of sparrows, it's next to the cricket field and they do fantastic hot rolls filled with huge slabs of cheese.