I've never owned a new car. Every car I have ever bought has been used. Only a couple of years old and relatively low mileage, but still used. It's worked out pretty well for me so far. I usually keep them 10+ years until there is a reason not to keep them anymore.
Yeah I've bought a few used cars over the years as well. I think it can be hit or miss but one thing I know for sure, the longer it sits there on the lot, the higher the chance that it will have some short-term issues.
So far, we've had great luck with the new cars we've bought. Hopefully I can keep that going!