Agreed from my experience of div 3 and div 4, some obvious "home team" umpires but generally speaking they're fair and at least consistent if sometimes incompetent. They are definitely better than the majority of the panel umpires I came across in divs 3 and 4 of Cherwell league.
Agreed - I've seen some shockers over the years, but only one or two that smacked of something nefarious.
Its funny how people perceive these things though - we played at Beaconsfield last year, and their umpire gave me a stinker (batting outside crease to a guy bowling huge in duckers, hit well forward - if I wasn't outside off, the angle of the ball would have taken it four stumps down). Walked off fuming. Later, our umpire gave their #3 an equally questionable one (I didn't appeal at slip, which is...rare for me!). Commiserated with him after the game, only to be told "but your one was definitely plumb". I was tempted to ask where Sir acquired those rose tinted spectacles!!!