What do you find to be wrong with it? It's always done the job well for me, whereas Sequel Pro, while a prettier face, and useable enough, manages to crash at least once a day.
PGAdmin crashes regularly, and in a very annoying (and stupid!) move blocks the UI for all the windows on some database operations e.g. adding indexes. It also blocks the UI when it's processing the results of a db query, which can be slow if there is a lot of data being returned. The interface is sort-of ok though.
I don't see how that's "unspeakable bad, terrible, terrible". Latest versions crash a lot less and if you really need to use UI during long database queries you can run another instance of pgadmin. It's still very useful and powerful tool.
