I guess I dont see what the huge deal is with Sunder. The problem as I remember it can be that there are two different explanations of Hardness and Item Hitpoints (one in the PHB and one in the DMG) between them we wound up where items had pretty good hardness / hitpoints. The +2 sword you mentioned I think would have something like 14 hardness and 30 or 40 hitpoints (cant remember which).
Anyhow Sunder is pretty much the Giant's only trick so I wouldnt worry about it too much. Not many other creatures have it either. As long as you arent *adding* it to stuff I dont think it should be an issue.
Fighters also get "screwed over" by disarmers and trippers but that doesnt mean you shouldnt use the feats if your creatures happen to have it. After all this isnt the World's Largest Dungeon Junior Edition. Being that you are using a pregenerated adventure that says right in it that they will face *every* creature in the SRD, I think you are well within your rights.
Anyhow Sunder is pretty much the Giant's only trick so I wouldnt worry about it too much. Not many other creatures have it either. As long as you arent *adding* it to stuff I dont think it should be an issue.
Fighters also get "screwed over" by disarmers and trippers but that doesnt mean you shouldnt use the feats if your creatures happen to have it. After all this isnt the World's Largest Dungeon Junior Edition. Being that you are using a pregenerated adventure that says right in it that they will face *every* creature in the SRD, I think you are well within your rights.