I'll go for Highbury. I don't know why, but I've always seemed to dislike it there. The pitch is annoying and small making it very easy for counter attacks. The atmosphere is OK though.
Only on bigsoccer would Highbury be the worst stadium in the world. Maybe you should make this thread, "Worst stadium in the World with 30,000 plus capacity" because most lower division teams are going to have the worst stadiums. This way, its more fair.
Stanford Stadium, Palto Alto, CA. Big open bowl with bench seats, perimeter fence, few exits and wooden structures. A veritable deathtrap yet amazingly a World Cup venue.
Loftus Road is crap. If you're in the upper tier of one of the stands behind the goals, you can hardly see the goal nearest you. A bit annoying for about four of the six we scored there a couple of years ago.
I love stadiums in general. Especially the smaller ones. Can't really think of a 'worst stadium' having started my fan career on a stand with a 7 feet high fence with barbed wire, followed by a fence up to the ceiling, followed by another 7 feet fence with big spikes on them in a stadium the size of an American bathroom stall and another with a running track and a big distance from the field (and a fence of course). I loved both of those stadiums and liked them a lot more than the arena. Allthough I'm finally getting used to it a bit and maybe even starting to feel at home in it a bit. When we moved to the Arena all fencing was gone. Nowadays when there's a big net all around the away-end it really bothers me. Funny actually.
The Meadowlands. Only there can a player try a cross and a wad of dirt ends up flying further than the ball.
Well, it could be worse. Like a second division pitch in Monserrat. But that would be an insult to Monserrat second-division piches.
Any olympic type stadium with running tracks is horrible. Tickets in the lowest sections in the curves should be free.
New Ferens Park, where Durham City and Sunderland reserves play. Not only is it miniscule (at a push about 2000), it seems to have its own climate which causes it to be much colder than the surrounding area. Even through a coat and two sweaters you still find yourself wondering why there aren't snowdrifts on the pitch. Plus the toilets are a shed and the ball goes into the car park every time someone hits a shot over.
Quite enjoyed my visit to New Ferens (FA Vase QF versus Wroxham). Nice crowd, but I can imagine it looks a bit desperate with a 150 people there.
Childish name-calling aside... You know why they put turf in there? The grass was absolutely pathetic. Artificial surfaces, IMO, have no place in football.
Any stadium in Central America. But, what they lack in facilities, players compensate with their dedication and commitment... Just follow any game on Fox Sport World or Fox Sport en Espanol and you realize how true that is...