I've only had a few boards that I just simply couldn't ride. One was in 95 or 96, I was riding 7.5 and 7.75 and tried out an 8.xx, it was just to big for me and my trucks. It felt like a couch on wheels. The other was about 5 years ago, I was at a park and met the owner of weirdo skateboards. Cool dude and I wanted to support/try out a new company so I bought a board from him. Shape was good but the concave, wheelbase and everything else were pretty terrible. Both of those decks were ridden for barely a day. Not bad for skating over 20 years.