The abominations are a bit rough when first getting to them. Depends on skill level and skill of the player. If you can reliably parry them then they are not a big issue but in level three troll or bronze you won't be able to tank many hits if you miss a block.

Best option early on is to use fire arrows. They are weak to fire but still take a ton of shots. That is fine with me though since the swamp is where I usually want to work my bow skill up anyway.

Once you are in Iron gear / food level you can clean them up pretty well with an ax or sword since they are weak to slash also.

In wolf gear and silver sword you can just charge in on them. That makes sense though since by that time you are basically ready to enter the plains.