Ditto. I have built hundreds of kits, and several ARF's, and in the past few years I have seen a decline in the quality of hardware. Most of the bigger manufacturers use quality stuff (Sig, Great Planes, Goldberg just to name a few) but some of the smaller companies are really putting some crap in those hardware bags.

My advice:
If it looks like Nylon, use it.
If it looks like plastic, replace it.