if it's in working condition (meaning the tablet is usb, pen is there and it's working well, as Arshes mentioned), you're fine.
getting replacement parts is close to impossible and you won't get any customer service from wacom as their last intuos 2 tablet was sold about 7 years ago.
current wacom drivers don't support intuos 2 officially is well, but they still have older builds online (and current drivers might still work.)
I miss intuos 2 pen design quite a lot, it was wacom's finest probably. even if not so classy looking as current pen line-up.
@ Arshes Nei
intuos 2 has extra value of tilt and bearing features (later only needed by certain corel painter brushes though), as opposed to only pressure sensitive bamboo.