That'll happen, OP.
8cr13 is not overly good stuff. My experience has been that it goes dull pretty quickly, and that it is very prone to chipping when it hits harder materials (ex: staples in boxes, or rocks / sand in topsoil) where other steels tend to just roll a bit or have minor deformations. Chipping is a major pain in the butt and if you took the time to sharpen out every little chip when you were sharpening it, I can see how it would take a long time. I sold mine quite a while ago because I didn't think the steel was any good for my uses, either - When it comes to inexpensive knives, I prefer something (ideally) that holds an edge better, or at the very least something that is less prone to chipping (ex: Aus-8, 14c28n, 440C, 440A, etc). Obviously any steel will go dull if you cut soil with it, but it takes longer to sharpen steels that are prone to chipping than it will steels that aren't.
If you're not happy with the knife, don't use it - people might tell you you're full of crap for disliking it, but for what it's worth, I don't like the Tenacious at all either.
I do, however, friggin' love every one of the USA-made spydercos I've handled to date. I like the Manixes enough that I've bought a half dozen of the things, so if I were you, I wouldn't write off the whole company just yet.