Do you generally like your tenants?

Frequently, I encounter people that are reticent to become investors because they believe that tenants are a major, consistent problem. I think this is a fair assumption as it is something that seems to be theme that runs through owning property. That said, I own four investments, and have had a lot of tenants with almost zero issues (knock on wood). Likewise, a lot of my investor clients don't seem to have major issues with their tenants either. I'm curious if this is just a myth or if people on this site feel that the notion "tenants will be a problem" is a fair assumption.