I didn't mention DW or Swamp because they've got two paths to the flag. It's still pretty frustrating to have the staircases blocked at those towers, but at least it requires some form of guild coordination to have two players blocking at once.

If you look at Sardon's, the entire tower is a single pathway. At MoD, you can go around the top staircase, but going all the way around completely removes the spawn point advantage that the defending guild should have. I don't think chokes are bad, but when a single person can prevent an entire guild from making an attack it just sucks.