usually have a rating of seven; anything lower than seven is better than average.
Some of the best cameras go as low as two and five is sufficient for most professional work.
The type of media you record onto can make all the difference. Many video camera manufacturers no longer make video cameras that record to tape. MiniDV and mini DVD-R+R were once all the rage but these are also slowly falling out of favour. Some cameras have an internal hard drive. These work well for large storage but they can only be transferred with a wired connection to a computer.
If you will be using video for a multitude of uses, the best choice of media are removable memory cards. SDHC is the standard but some brands, such as Sony, use Memory Stick which works just as well. Stay away from formats other than SDHC or Memory Stick, if