I guess you never watched the movie Gremlins. Rotting corpses with pieces falling off don't seem to be very tough to me, especially the ones that have had all their flesh drop off and are just animated bones. Leeches are weak sauce. Blobs are simple and even oozers are nothing to worry about (even in Bronze gear) if you have poison resist meads. An Abomination is no match for a Fuling Berserker (especially if backed up by a shaman) and I could tell that the very first time I went up against a Berserker. The most difficult thing about the swamp is navigating it.