Bullet sponges are a bad thing, imo. Introduced with ridiculous HP levels, i fail to see how something that is still technically just a sick human, take 100 shots to the face with a shotgun. Good riddance to bad rubbish.
you know whats worse than bullet sponges? not having any tough enemies besides deathclaws to fight, the NPC mostly all have melee weapons, not many of them have any of the weapons the player uses like marksman rifles, multiplas rifles, sniper rifles etc, only the fiends use energy weapons, ncr for the most part are armed with service rifles, there's NO enemey patrols on the map, you can travel all around the map and not find hardly any humans to fight except for ones at outposts, there's not a lot to explore, the caves are all small, there's no big buildings to fight in like the capitol building, or lob enterprises, or the national archives, or the roosovelt academy or red racer factor or chryslus building, i could go on and on here, obviously obsidians strong points are story, quests and dialogue, but exploring, dungeons, enemies to fight, i would have to say bethesda pretty much blows obsidian out of the water in those areas.