There is also an amazing amount of damage a landlord can do to a property.  Not doing repairs comes to mind and then renting the property while stating "everything works" when it does not.  Try to get a landlord to honor his or her commitments.

Normal wear and tear is just that.  Above it is destruction.

Colorado Law requires properties have working heat.  Many landlords try to skirt around the laws by claiming it's tenants faults.

If you can't stand the heat of being a landlord, sell the property.

Landlords also judge every tenant by the worst tenant they ever had.  In return, we remember the worst landlord we had and judge every landlord by that criteria.

No two landlords are alike just like no two tenants are alike.