Building block patents
My first, and only, computer board was patented by my employer. My design was both good and original, but what was good was not original and what was original was not good. I'd ripped off / improved upon a previous design already patented by my employer. I wouldn't have been granted a patent as an individual because it encroached too much on their previous patent for a far inferior product.
It made me think that companies patent basically worthless stuff so they can later improve it and patent the improvement. A shoddy product first to market simply to block competitors while the kinks are being ironed out.