stereotypes don't typically create themselves. They are usually there for a good reason. How many JDM imports have you seen? If you are basing it off of your car, that is a really really narrow test sample. It could be that you got really lucky.
I'm not taking sides here. I just don't see any reason for bad stereotypes of JDM cars to exist unless there is a real reason. A lot of people (myself included) think RHD is stupid in a LHD country, but that is no reason to talk about how most JDM cars are in shitty condition. If they are typically really nice then I doubt there would be much criticism other than being RHD.